{"title":"Sandpiper Heavy Duty AODD Pump Flap Valves","description":"\u003cp class=\"PDq2pG_selectionAnchorContainer\"\u003eBrowse \u003cstrong\u003egenuine Sandpiper Heavy Duty AODD pump flap valves\u003c\/strong\u003e for compatible HD20F, HDF1\/HDF25, HDF2 and HDF3\/HDF4 Heavy Duty Flap Valve pump configurations. Flap valves are moving wet-end check-valve components that open away from the flap valve seat to allow forward fluid movement and close against the seat to restrict reverse flow.\u003cspan class=\"PDq2pG_selectionAnchor\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eSandpiper Heavy Duty flap valves are available in different \u003cstrong\u003ematerials and part-number configurations depending on the pump model and construction\u003c\/strong\u003e. The correct replacement should be selected according to the \u003cstrong\u003eexact pump model, pump construction, flap valve material and manufacturer part number\u003c\/strong\u003e. Available materials vary by model and should be verified against the applicable Sandpiper service manual.\u003c\/p\u003e\n\u003cp\u003eHeavy Duty Flap Valve pumps use a relatively open fluid path and are designed by Sandpiper for demanding services involving solids and slurry handling. Sandpiper lists HD20F Non-Metallic, HDF1\/HDF25 Metallic, HDF2 Metallic and HDF3\/HDF4 Metallic within its current Heavy Duty Flap range. \u003cspan class=\"contents\"\u003e\u003cspan class=\"\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eSelect your Sandpiper Heavy Duty pump model below to find compatible \u003cstrong\u003eflap valve materials and manufacturer part numbers\u003c\/strong\u003e. If you are unsure which flap valve is required, provide ABS Engineering with the complete pump model, nameplate details, pump construction or existing flap valve part number for verification before ordering.\u003c\/p\u003e","products":[{"product_id":"sandpiper-hdf1-hdf25-aodd-pump-flap-valves","title":"Sandpiper HDF1\/HDF25 1\" Heavy Duty AODD Pump Flap Valves for Metallic Pumps","description":"\u003cdiv class=\"sp-flap-desc\"\u003e\n\u003cstyle\u003e.sp-flap-desc{--sp-blue:#1e3a8a;--sp-blue-light:#eef2ff;--sp-blue-soft:#f7f9ff;--sp-text:#2b2f38;--sp-muted:#626977;--sp-border:#e1e5ec;--sp-white:#fff;max-width:1100px;margin:0 auto;font-family:Arial,Helvetica,sans-serif;color:var(--sp-text);line-height:1.65}.sp-flap-desc *{box-sizing:border-box}.sp-flap-desc h2{color:var(--sp-blue);font-size:27px;line-height:1.3;margin:0 0 12px}.sp-flap-desc h3{color:var(--sp-blue);font-size:21px;line-height:1.35;margin:38px 0 14px}.sp-flap-desc h4{color:var(--sp-blue);font-size:15px;line-height:1.4;margin:0 0 8px}.sp-flap-desc p{margin:0 0 14px;font-size:15px}.sp-flap-desc ul{margin:0;padding-left:20px;font-size:15px}.sp-flap-desc li{margin-bottom:7px}.sp-eyebrow{display:inline-block;color:var(--sp-blue);background:var(--sp-blue-light);font-size:12px;font-weight:700;letter-spacing:.5px;text-transform:uppercase;padding:6px 11px;border-radius:20px;margin-bottom:12px}.sp-intro{font-size:16px!important;color:var(--sp-muted);max-width:880px;margin-bottom:22px!important}.sp-atomic-answer{font-size:16px!important;background:var(--sp-blue-soft);border-left:4px solid var(--sp-blue);padding:18px 20px;border-radius:0 8px 8px 0;margin:0 0 28px!important}.sp-overview-wrap{display:grid;grid-template-columns:minmax(0,2fr) minmax(240px,1fr);gap:28px;align-items:start;margin:24px 0 28px}.sp-ideal-for{background:var(--sp-blue-soft);border:1px solid #dfe5f5;border-radius:12px;padding:22px}.sp-ideal-for h4{font-size:16px;margin-bottom:12px}.sp-benefit-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:16px;margin:22px 0 38px}.sp-benefit-card{border:1px solid var(--sp-border);border-radius:10px;padding:20px;background:var(--sp-white)}.sp-benefit-number{width:30px;height:30px;display:flex;align-items:center;justify-content:center;background:var(--sp-blue-light);color:var(--sp-blue);border-radius:50%;font-size:13px;font-weight:700;margin-bottom:13px}.sp-benefit-card p{font-size:14px;color:var(--sp-muted);margin:0}.sp-table-wrap{overflow-x:auto;margin:18px 0 38px;border:1px solid var(--sp-border);border-radius:10px}.sp-spec-table,.sp-part-table{width:100%;border-collapse:collapse;font-size:14px;min-width:580px}.sp-spec-table th,.sp-spec-table td,.sp-part-table td{text-align:left;padding:13px 16px;border-bottom:1px solid var(--sp-border);vertical-align:top}.sp-spec-table th{width:34%;color:var(--sp-blue);background:#f8f9fc;font-weight:700}.sp-part-table th{background:var(--sp-blue);color:#fff;padding:12px 14px;text-align:left}.sp-part-table tr:nth-child(even) td{background:#f8f9fc}.sp-note{border-left:4px solid var(--sp-blue);background:var(--sp-blue-soft);padding:16px 18px;margin:18px 0 34px;border-radius:0 8px 8px 0;font-size:14px}.sp-faq{border-top:1px solid var(--sp-border);margin-bottom:36px}.sp-faq details{border-bottom:1px solid var(--sp-border)}.sp-faq summary{cursor:pointer;list-style:none;color:var(--sp-blue);font-size:15px;font-weight:700;padding:17px 34px 17px 4px;position:relative}.sp-faq summary::-webkit-details-marker{display:none}.sp-faq summary:after{content:'+';position:absolute;right:5px;top:14px;font-size:22px;font-weight:400}.sp-faq details[open] summary:after{content:'−'}.sp-faq details p{padding:0 4px 17px;color:var(--sp-muted);font-size:14px}.sp-related-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:16px;margin:20px 0 38px}.sp-related-card{border:1px solid var(--sp-border);border-radius:10px;padding:20px;background:#fff;display:flex;flex-direction:column;min-height:180px}.sp-related-label{display:inline-block;width:max-content;color:var(--sp-blue);background:var(--sp-blue-light);padding:5px 9px;border-radius:16px;font-size:11px;font-weight:700;margin-bottom:12px}.sp-related-card h4{font-size:16px;margin-bottom:8px}.sp-related-card p{color:var(--sp-muted);font-size:13px;flex-grow:1}.sp-related-card a{color:var(--sp-blue);font-size:13px;font-weight:700;text-decoration:none}.sp-help-banner{background:var(--sp-blue);color:#fff;border-radius:12px;padding:28px 30px;display:flex;justify-content:space-between;align-items:center;gap:24px;flex-wrap:wrap;margin-top:40px}.sp-help-banner h3{color:#fff;margin:0 0 7px;font-size:20px}.sp-help-banner p{color:#e4e9f8;font-size:14px;margin:0;max-width:660px}.sp-cta-links{display:flex;gap:10px;flex-wrap:wrap}.sp-cta-links a{background:#fff;color:var(--sp-blue);text-decoration:none;font-weight:700;font-size:14px;padding:12px 22px;border-radius:25px}@media(max-width:760px){.sp-flap-desc h2{font-size:23px}.sp-overview-wrap{grid-template-columns:1fr}.sp-cta-links{width:100%}.sp-cta-links a{width:100%;text-align:center}}\u003c\/style\u003e\n\u003cspan class=\"sp-eyebrow\"\u003eGenuine Sandpiper Replacement Part\u003c\/span\u003e\n\u003ch2\u003eSandpiper HDF1\/HDF25 1\" Heavy Duty AODD Pump Flap Valves for Metallic Pumps\u003c\/h2\u003e\n\u003cp class=\"sp-intro\"\u003eGenuine Sandpiper flap valve replacement parts for compatible HDF1\/HDF25 1\" Metallic AODD pumps. Pump construction identifies the compatible pump configuration; the flap valve material is selected separately from the manufacturer-listed options below.\u003c\/p\u003e\n\u003cp class=\"sp-atomic-answer\"\u003eThe \u003cstrong\u003eSandpiper HDF1\/HDF25 flap valve\u003c\/strong\u003e is the moving wet-end check-valve component used in compatible flap-valve AODD pumps. It opens away from the flap valve seat to allow forward fluid movement and closes against the seat to restrict reverse flow. Select the replacement by exact pump model, pump construction, flap valve material and Sandpiper manufacturer part number.\u003c\/p\u003e\n\u003ch3\u003eProduct Overview\u003c\/h3\u003e\n\u003cdiv class=\"sp-overview-wrap\"\u003e\n\u003cdiv\u003e\n\u003cp\u003eThe \u003cstrong\u003eSandpiper HDF1\/HDF25 flap valve\u003c\/strong\u003e is intended for servicing compatible 1\" Metallic flap-valve AODD pumps.\u003c\/p\u003e\n\u003cp\u003eThe flap valve and its mating seat work together as a one-way wet-end check valve. The flap valve is the moving replacement component; the flap valve seat and related hinge, wear, retainer or sealing components are separate parts where Sandpiper lists them separately.\u003c\/p\u003e\n\u003cp\u003eManufacturer-listed flap valve selections for this product include \u003cstrong\u003eSantoprene, Hytrel, Nitrile, FKM, EPDM, Neoprene\u003c\/strong\u003e. Select the exact material and manufacturer part number for the installed pump. Do not select the flap valve from nominal pump size or diaphragm material alone.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sp-ideal-for\"\u003e\n\u003ch4\u003eRecommended For\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eHeavy Duty Flap Valve wet-end maintenance\u003c\/li\u003e\n\u003cli\u003eReplacement of worn or damaged flap valves\u003c\/li\u003e\n\u003cli\u003eFlap check-valve inspection and servicing\u003c\/li\u003e\n\u003cli\u003eMaterial-specific replacement\u003c\/li\u003e\n\u003cli\u003eCritical maintenance spare-parts stock\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch3\u003eCompatibility \u0026amp; Product Details\u003c\/h3\u003e\n\u003cdiv class=\"sp-table-wrap\"\u003e\u003ctable class=\"sp-spec-table\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003ctd\u003eSandpiper\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCompatible Pump Model\u003c\/th\u003e\n\u003ctd\u003eHDF1\/HDF25\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePump Family\u003c\/th\u003e\n\u003ctd\u003eHeavy Duty Flap Valve AODD Pump\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eNominal Pump Size\u003c\/th\u003e\n\u003ctd\u003e1\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePart Type\u003c\/th\u003e\n\u003ctd\u003eFlap Valve\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCompatible Pump Construction\u003c\/th\u003e\n\u003ctd\u003eMetallic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eManufacturer Manual Terminology\u003c\/th\u003e\n\u003ctd\u003eFlap Valve\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eShopify Variant Option\u003c\/th\u003e\n\u003ctd\u003eFlap Valve Material\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eManufacturer-Listed Pump Quantity\u003c\/th\u003e\n\u003ctd\u003e4 flap valves used per pump\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSelection Basis\u003c\/th\u003e\n\u003ctd\u003eExact pump model \/ pump construction \/ flap valve material \/ manufacturer part number\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003c\/div\u003e\n\u003ch3\u003eHow to Select the Correct HDF1\/HDF25 Flap Valve\u003c\/h3\u003e\n\u003cp\u003eConfirm the complete pump identification before ordering. The pump model and construction establish the applicable flap-valve family, while the flap valve material must match the manufacturer-listed part number.\u003c\/p\u003e\n\u003cdiv class=\"sp-benefit-grid\"\u003e\n\u003cdiv class=\"sp-benefit-card\"\u003e\n\u003cdiv class=\"sp-benefit-number\"\u003e01\u003c\/div\u003e\n\u003ch4\u003eConfirm Pump Model\u003c\/h4\u003e\n\u003cp\u003eVerify the complete Sandpiper HDF1\/HDF25 pump identification from the pump nameplate.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sp-benefit-card\"\u003e\n\u003cdiv class=\"sp-benefit-number\"\u003e02\u003c\/div\u003e\n\u003ch4\u003eConfirm Pump Construction\u003c\/h4\u003e\n\u003cp\u003eCheck that the installed pump matches the Metallic construction covered by this product page.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sp-benefit-card\"\u003e\n\u003cdiv class=\"sp-benefit-number\"\u003e03\u003c\/div\u003e\n\u003ch4\u003eSelect Flap Valve Material\u003c\/h4\u003e\n\u003cp\u003eChoose only from manufacturer-listed flap valve materials for the applicable pump configuration.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sp-benefit-card\"\u003e\n\u003cdiv class=\"sp-benefit-number\"\u003e04\u003c\/div\u003e\n\u003ch4\u003eVerify Part Number\u003c\/h4\u003e\n\u003cp\u003eMatch the selected flap valve to the exact Sandpiper manufacturer part number in the current service manual.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch3\u003eSandpiper HDF1\/HDF25 Flap Valve Part Numbers\u003c\/h3\u003e\n\u003cdiv class=\"sp-table-wrap\"\u003e\u003ctable class=\"sp-part-table\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eFlap Valve Material\u003c\/th\u003e\n\u003cth\u003eManufacturer Part Number\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eSantoprene\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e338.014.354\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHytrel\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e338.014.356\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNitrile\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e338.014.360\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFKM\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e338.014.363\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEPDM\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e338.014.364\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNeoprene\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e338.014.365\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\n\u003cdiv class=\"sp-note\"\u003e\n\u003cstrong\u003eManufacturer Terminology Note:\u003c\/strong\u003e The applicable Sandpiper service manual identifies this replacement component as \u003cstrong\u003eFlap Valve\u003c\/strong\u003e. For consistent customer navigation, this Shopify listing uses “Flap Valve” as the primary spare-part name.\u003c\/div\u003e\n\u003cdiv class=\"sp-note\"\u003e\n\u003cstrong\u003eQuantity Note:\u003c\/strong\u003e The applicable Sandpiper repair-parts list shows four flap valves used in the pump. This is the installed pump quantity and does not confirm a commercial sales pack of four. Confirm supplied quantity before listing or ordering.\u003c\/div\u003e\n\u003cdiv class=\"sp-note\"\u003e\n\u003cstrong\u003eSelection Note:\u003c\/strong\u003e A flap valve is the moving check-valve component and should not be assumed to include the flap valve seat, hinge pad, wear pad, retainer or seals unless the exact manufacturer documentation states otherwise. Verify chemical compatibility and the exact manufacturer part number before ordering.\u003c\/div\u003e\n\u003ch3\u003eWhy Choose Genuine Sandpiper Flap Valves?\u003c\/h3\u003e\n\u003cp\u003eGenuine Sandpiper flap valves are manufacturer-listed wet-end replacement components for compatible Sandpiper flap-valve AODD pumps. Matching the exact model, pump construction, flap valve material and manufacturer part number helps maintenance engineers and purchasing teams identify the correct replacement component.\u003c\/p\u003e\n\u003cdiv class=\"sp-benefit-grid\"\u003e\n\u003cdiv class=\"sp-benefit-card\"\u003e\n\u003cdiv class=\"sp-benefit-number\"\u003e01\u003c\/div\u003e\n\u003ch4\u003eModel-Specific Compatibility\u003c\/h4\u003e\n\u003cp\u003eSelect according to the verified Sandpiper pump model and construction rather than nominal size alone.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sp-benefit-card\"\u003e\n\u003cdiv class=\"sp-benefit-number\"\u003e02\u003c\/div\u003e\n\u003ch4\u003eMaterial Selection\u003c\/h4\u003e\n\u003cp\u003eUse only manufacturer-listed flap valve materials for the applicable pump configuration.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sp-benefit-card\"\u003e\n\u003cdiv class=\"sp-benefit-number\"\u003e03\u003c\/div\u003e\n\u003ch4\u003eExact Part Identification\u003c\/h4\u003e\n\u003cp\u003eUse the Sandpiper manufacturer part number to support accurate maintenance and procurement.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sp-benefit-card\"\u003e\n\u003cdiv class=\"sp-benefit-number\"\u003e04\u003c\/div\u003e\n\u003ch4\u003eGenuine Sandpiper Replacement Part\u003c\/h4\u003e\n\u003cp\u003eMaintain compatible Sandpiper pumps using genuine manufacturer replacement components.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch3\u003eWhen Should HDF1\/HDF25 Flap Valves Be Inspected?\u003c\/h3\u003e\n\u003cp\u003eInspect the flap-valve area during planned wet-end maintenance and whenever check-valve operation requires investigation.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eThe flap valve shows visible wear, cuts, deformation or damage\u003c\/li\u003e\n\u003cli\u003eForeign material prevents the flap from closing correctly against the seat\u003c\/li\u003e\n\u003cli\u003eThe mating flap valve seat shows wear or damage\u003c\/li\u003e\n\u003cli\u003ePump priming, solids handling or check-valve sealing requires investigation\u003c\/li\u003e\n\u003cli\u003eThe pump is undergoing scheduled wet-end maintenance\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cdiv class=\"sp-faq\"\u003e\n\u003cdetails\u003e\u003csummary\u003eWhat is the Sandpiper HDF1\/HDF25 flap valve?\u003c\/summary\u003e\u003cp\u003eIt is the moving wet-end check-valve component used in compatible Sandpiper HDF1\/HDF25 flap-valve AODD pumps. It opens away from and closes against the flap valve seat as the pump cycles.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eIs the flap valve the same as the complete flap-valve system?\u003c\/summary\u003e\u003cp\u003eNo. The flap valve is the moving replacement component. The flap valve seat and related hinge, wear, retainer or sealing components are separate parts where Sandpiper lists them separately.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eWhich flap valve materials are listed for this HDF1\/HDF25?\u003c\/summary\u003e\u003cp\u003eThe manufacturer-listed selections shown on this page are Santoprene, Hytrel, Nitrile, FKM, EPDM, Neoprene. Confirm the exact manufacturer part number and chemical compatibility before ordering.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eAre flap valve seats included with these flap valves?\u003c\/summary\u003e\u003cp\u003eDo not assume a flap valve seat is included with an individual flap valve part number. Sandpiper lists seats separately on applicable service-parts lists unless a specific kit or assembly states otherwise.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eHow do I confirm the correct HDF1\/HDF25 flap valve?\u003c\/summary\u003e\u003cp\u003eCheck the complete pump model and construction, identify the required flap valve material and verify the corresponding Sandpiper manufacturer part number against the current service manual.\u003c\/p\u003e\u003c\/details\u003e\n\u003c\/div\u003e\n\u003ch3 style=\"text-align:center;\"\u003eExplore Other Sandpiper Wet-End Parts\u003c\/h3\u003e\n\u003cdiv class=\"sp-related-grid\"\u003e\n\u003cdiv class=\"sp-related-card\"\u003e\n\u003cspan class=\"sp-related-label\"\u003eFlap Valves\u003c\/span\u003e\u003ch4\u003eAll Sandpiper AODD Pump Flap Valves\u003c\/h4\u003e\n\u003cp\u003eBrowse genuine Sandpiper flap valves by pump model, construction, material and manufacturer part number.\u003c\/p\u003e\n\u003ca href=\"\/collections\/sandpiper-aodd-pump-flap-valves\"\u003eView Collection →\u003c\/a\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sp-related-card\"\u003e\n\u003cspan class=\"sp-related-label\"\u003eBall Valve Parts\u003c\/span\u003e\u003ch4\u003eSandpiper AODD Pump Check Balls\u003c\/h4\u003e\n\u003cp\u003eLooking for a ball-type check-valve pump? Browse genuine Sandpiper AODD pump check balls.\u003c\/p\u003e\n\u003ca href=\"\/collections\/sandpiper-aodd-pump-check-balls\"\u003eView Collection →\u003c\/a\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sp-help-banner\"\u003e\n\u003cdiv\u003e\n\u003ch3\u003eNeed Help Selecting the Correct HDF1\/HDF25 Flap Valve?\u003c\/h3\u003e\n\u003cp\u003eSend ABS Engineering your complete Sandpiper HDF1\/HDF25 pump model, nameplate details, pump construction and existing flap valve part number for verification before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sp-cta-links\"\u003e\n\u003ca href=\"\/pages\/contact\"\u003eRequest a Quote\u003c\/a\u003e\u003ca href=\"\/pages\/contact\"\u003eRequest Part Verification\u003c\/a\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"SANDPIPER","offers":[{"title":"Santoprene","offer_id":53332470497461,"sku":"338.014.354","price":0.0,"currency_code":"MYR","in_stock":false},{"title":"Hytrel","offer_id":53332470530229,"sku":"338.014.356","price":0.0,"currency_code":"MYR","in_stock":false},{"title":"Nitrile","offer_id":53332470562997,"sku":"338.014.360","price":0.0,"currency_code":"MYR","in_stock":false},{"title":"FKM","offer_id":53332470595765,"sku":"338.014.363","price":0.0,"currency_code":"MYR","in_stock":false},{"title":"EPDM","offer_id":53332470628533,"sku":"338.014.364","price":0.0,"currency_code":"MYR","in_stock":false},{"title":"Neoprene","offer_id":53332470661301,"sku":"338.014.365","price":0.0,"currency_code":"MYR","in_stock":false}]},{"product_id":"sandpiper-hdf2-hdf50-aodd-pump-flap-valves","title":"Sandpiper HDF2\/HDF50 2\" Heavy Duty AODD Pump Flap Valves for Metallic Pumps","description":"\u003cdiv class=\"sp-flap-desc\"\u003e\n\u003cstyle\u003e.sp-flap-desc{--sp-blue:#1e3a8a;--sp-blue-light:#eef2ff;--sp-blue-soft:#f7f9ff;--sp-text:#2b2f38;--sp-muted:#626977;--sp-border:#e1e5ec;--sp-white:#fff;max-width:1100px;margin:0 auto;font-family:Arial,Helvetica,sans-serif;color:var(--sp-text);line-height:1.65}.sp-flap-desc *{box-sizing:border-box}.sp-flap-desc h2{color:var(--sp-blue);font-size:27px;line-height:1.3;margin:0 0 12px}.sp-flap-desc h3{color:var(--sp-blue);font-size:21px;line-height:1.35;margin:38px 0 14px}.sp-flap-desc h4{color:var(--sp-blue);font-size:15px;line-height:1.4;margin:0 0 8px}.sp-flap-desc p{margin:0 0 14px;font-size:15px}.sp-flap-desc ul{margin:0;padding-left:20px;font-size:15px}.sp-flap-desc li{margin-bottom:7px}.sp-eyebrow{display:inline-block;color:var(--sp-blue);background:var(--sp-blue-light);font-size:12px;font-weight:700;letter-spacing:.5px;text-transform:uppercase;padding:6px 11px;border-radius:20px;margin-bottom:12px}.sp-intro{font-size:16px!important;color:var(--sp-muted);max-width:880px;margin-bottom:22px!important}.sp-atomic-answer{font-size:16px!important;background:var(--sp-blue-soft);border-left:4px solid var(--sp-blue);padding:18px 20px;border-radius:0 8px 8px 0;margin:0 0 28px!important}.sp-overview-wrap{display:grid;grid-template-columns:minmax(0,2fr) minmax(240px,1fr);gap:28px;align-items:start;margin:24px 0 28px}.sp-ideal-for{background:var(--sp-blue-soft);border:1px solid #dfe5f5;border-radius:12px;padding:22px}.sp-ideal-for h4{font-size:16px;margin-bottom:12px}.sp-benefit-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:16px;margin:22px 0 38px}.sp-benefit-card{border:1px solid var(--sp-border);border-radius:10px;padding:20px;background:var(--sp-white)}.sp-benefit-number{width:30px;height:30px;display:flex;align-items:center;justify-content:center;background:var(--sp-blue-light);color:var(--sp-blue);border-radius:50%;font-size:13px;font-weight:700;margin-bottom:13px}.sp-benefit-card p{font-size:14px;color:var(--sp-muted);margin:0}.sp-table-wrap{overflow-x:auto;margin:18px 0 38px;border:1px solid var(--sp-border);border-radius:10px}.sp-spec-table,.sp-part-table{width:100%;border-collapse:collapse;font-size:14px;min-width:580px}.sp-spec-table th,.sp-spec-table td,.sp-part-table td{text-align:left;padding:13px 16px;border-bottom:1px solid var(--sp-border);vertical-align:top}.sp-spec-table th{width:34%;color:var(--sp-blue);background:#f8f9fc;font-weight:700}.sp-part-table th{background:var(--sp-blue);color:#fff;padding:12px 14px;text-align:left}.sp-part-table tr:nth-child(even) td{background:#f8f9fc}.sp-note{border-left:4px solid var(--sp-blue);background:var(--sp-blue-soft);padding:16px 18px;margin:18px 0 34px;border-radius:0 8px 8px 0;font-size:14px}.sp-faq{border-top:1px solid var(--sp-border);margin-bottom:36px}.sp-faq details{border-bottom:1px solid var(--sp-border)}.sp-faq summary{cursor:pointer;list-style:none;color:var(--sp-blue);font-size:15px;font-weight:700;padding:17px 34px 17px 4px;position:relative}.sp-faq summary::-webkit-details-marker{display:none}.sp-faq summary:after{content:'+';position:absolute;right:5px;top:14px;font-size:22px;font-weight:400}.sp-faq details[open] summary:after{content:'−'}.sp-faq details p{padding:0 4px 17px;color:var(--sp-muted);font-size:14px}.sp-related-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:16px;margin:20px 0 38px}.sp-related-card{border:1px solid var(--sp-border);border-radius:10px;padding:20px;background:#fff;display:flex;flex-direction:column;min-height:180px}.sp-related-label{display:inline-block;width:max-content;color:var(--sp-blue);background:var(--sp-blue-light);padding:5px 9px;border-radius:16px;font-size:11px;font-weight:700;margin-bottom:12px}.sp-related-card h4{font-size:16px;margin-bottom:8px}.sp-related-card p{color:var(--sp-muted);font-size:13px;flex-grow:1}.sp-related-card a{color:var(--sp-blue);font-size:13px;font-weight:700;text-decoration:none}.sp-help-banner{background:var(--sp-blue);color:#fff;border-radius:12px;padding:28px 30px;display:flex;justify-content:space-between;align-items:center;gap:24px;flex-wrap:wrap;margin-top:40px}.sp-help-banner h3{color:#fff;margin:0 0 7px;font-size:20px}.sp-help-banner p{color:#e4e9f8;font-size:14px;margin:0;max-width:660px}.sp-cta-links{display:flex;gap:10px;flex-wrap:wrap}.sp-cta-links a{background:#fff;color:var(--sp-blue);text-decoration:none;font-weight:700;font-size:14px;padding:12px 22px;border-radius:25px}@media(max-width:760px){.sp-flap-desc h2{font-size:23px}.sp-overview-wrap{grid-template-columns:1fr}.sp-cta-links{width:100%}.sp-cta-links a{width:100%;text-align:center}}\u003c\/style\u003e\n\u003cspan class=\"sp-eyebrow\"\u003eGenuine Sandpiper Replacement Part\u003c\/span\u003e\n\u003ch2\u003eSandpiper HDF2\/HDF50 2\" Heavy Duty AODD Pump Flap Valves for Metallic Pumps\u003c\/h2\u003e\n\u003cp class=\"sp-intro\"\u003eGenuine Sandpiper flap valve replacement parts for compatible HDF2\/HDF50 2\" Metallic AODD pumps. Pump construction identifies the compatible pump configuration; the flap valve material is selected separately from the manufacturer-listed options below.\u003c\/p\u003e\n\u003cp class=\"sp-atomic-answer\"\u003eThe \u003cstrong\u003eSandpiper HDF2\/HDF50 flap valve\u003c\/strong\u003e is the moving wet-end check-valve component used in compatible flap-valve AODD pumps. It opens away from the flap valve seat to allow forward fluid movement and closes against the seat to restrict reverse flow. Select the replacement by exact pump model, pump construction, flap valve material and Sandpiper manufacturer part number.\u003c\/p\u003e\n\u003ch3\u003eProduct Overview\u003c\/h3\u003e\n\u003cdiv class=\"sp-overview-wrap\"\u003e\n\u003cdiv\u003e\n\u003cp\u003eThe \u003cstrong\u003eSandpiper HDF2\/HDF50 flap valve\u003c\/strong\u003e is intended for servicing compatible 2\" Metallic flap-valve AODD pumps.\u003c\/p\u003e\n\u003cp\u003eThe flap valve and its mating seat work together as a one-way wet-end check valve. The flap valve is the moving replacement component; the flap valve seat and related hinge, wear, retainer or sealing components are separate parts where Sandpiper lists them separately.\u003c\/p\u003e\n\u003cp\u003eManufacturer-listed flap valve selections for this product include \u003cstrong\u003eBuna, FKM, EPDM, Neoprene, Urethane, Hytrel, Santoprene\u003c\/strong\u003e. Select the exact material and manufacturer part number for the installed pump. Do not select the flap valve from nominal pump size or diaphragm material alone.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sp-ideal-for\"\u003e\n\u003ch4\u003eRecommended For\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eHeavy Duty Flap Valve wet-end maintenance\u003c\/li\u003e\n\u003cli\u003eReplacement of worn or damaged flap valves\u003c\/li\u003e\n\u003cli\u003eFlap check-valve inspection and servicing\u003c\/li\u003e\n\u003cli\u003eMaterial-specific replacement\u003c\/li\u003e\n\u003cli\u003eCritical maintenance spare-parts stock\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch3\u003eCompatibility \u0026amp; Product Details\u003c\/h3\u003e\n\u003cdiv class=\"sp-table-wrap\"\u003e\u003ctable class=\"sp-spec-table\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003ctd\u003eSandpiper\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCompatible Pump Model\u003c\/th\u003e\n\u003ctd\u003eHDF2\/HDF50\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePump Family\u003c\/th\u003e\n\u003ctd\u003eHeavy Duty Flap Valve AODD Pump\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eNominal Pump Size\u003c\/th\u003e\n\u003ctd\u003e2\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePart Type\u003c\/th\u003e\n\u003ctd\u003eFlap Valve\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCompatible Pump Construction\u003c\/th\u003e\n\u003ctd\u003eMetallic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eManufacturer Manual Terminology\u003c\/th\u003e\n\u003ctd\u003eValve, Flap Assembly\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eShopify Variant Option\u003c\/th\u003e\n\u003ctd\u003eFlap Valve Material\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eManufacturer-Listed Pump Quantity\u003c\/th\u003e\n\u003ctd\u003e4 flap valves used per pump\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSelection Basis\u003c\/th\u003e\n\u003ctd\u003eExact pump model \/ pump construction \/ flap valve material \/ manufacturer part number\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003c\/div\u003e\n\u003ch3\u003eHow to Select the Correct HDF2\/HDF50 Flap Valve\u003c\/h3\u003e\n\u003cp\u003eConfirm the complete pump identification before ordering. The pump model and construction establish the applicable flap-valve family, while the flap valve material must match the manufacturer-listed part number.\u003c\/p\u003e\n\u003cdiv class=\"sp-benefit-grid\"\u003e\n\u003cdiv class=\"sp-benefit-card\"\u003e\n\u003cdiv class=\"sp-benefit-number\"\u003e01\u003c\/div\u003e\n\u003ch4\u003eConfirm Pump Model\u003c\/h4\u003e\n\u003cp\u003eVerify the complete Sandpiper HDF2\/HDF50 pump identification from the pump nameplate.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sp-benefit-card\"\u003e\n\u003cdiv class=\"sp-benefit-number\"\u003e02\u003c\/div\u003e\n\u003ch4\u003eConfirm Pump Construction\u003c\/h4\u003e\n\u003cp\u003eCheck that the installed pump matches the Metallic construction covered by this product page.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sp-benefit-card\"\u003e\n\u003cdiv class=\"sp-benefit-number\"\u003e03\u003c\/div\u003e\n\u003ch4\u003eSelect Flap Valve Material\u003c\/h4\u003e\n\u003cp\u003eChoose only from manufacturer-listed flap valve materials for the applicable pump configuration.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sp-benefit-card\"\u003e\n\u003cdiv class=\"sp-benefit-number\"\u003e04\u003c\/div\u003e\n\u003ch4\u003eVerify Part Number\u003c\/h4\u003e\n\u003cp\u003eMatch the selected flap valve to the exact Sandpiper manufacturer part number in the current service manual.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch3\u003eSandpiper HDF2\/HDF50 Flap Valve Part Numbers\u003c\/h3\u003e\n\u003cdiv class=\"sp-table-wrap\"\u003e\u003ctable class=\"sp-part-table\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eFlap Valve Material\u003c\/th\u003e\n\u003cth\u003eManufacturer Part Number\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBuna\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e338.005.360\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFKM\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e338.005.363\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEPDM\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e338.005.364\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNeoprene\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e338.005.365\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUrethane\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e338.010.357\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHytrel\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e338.010.356\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSantoprene\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e338.010.354\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\n\u003cdiv class=\"sp-note\"\u003e\n\u003cstrong\u003eManufacturer Terminology Note:\u003c\/strong\u003e The applicable Sandpiper service manual identifies this replacement component as \u003cstrong\u003eValve, Flap Assembly\u003c\/strong\u003e. For consistent customer navigation, this Shopify listing uses “Flap Valve” as the primary spare-part name.\u003c\/div\u003e\n\u003cdiv class=\"sp-note\"\u003e\n\u003cstrong\u003eQuantity Note:\u003c\/strong\u003e The applicable Sandpiper repair-parts list shows four flap valves used in the pump. This is the installed pump quantity and does not confirm a commercial sales pack of four. Confirm supplied quantity before listing or ordering.\u003c\/div\u003e\n\u003cdiv class=\"sp-note\"\u003e\n\u003cstrong\u003eSelection Note:\u003c\/strong\u003e A flap valve is the moving check-valve component and should not be assumed to include the flap valve seat, hinge pad, wear pad, retainer or seals unless the exact manufacturer documentation states otherwise. Verify chemical compatibility and the exact manufacturer part number before ordering.\u003c\/div\u003e\n\u003ch3\u003eWhy Choose Genuine Sandpiper Flap Valves?\u003c\/h3\u003e\n\u003cp\u003eGenuine Sandpiper flap valves are manufacturer-listed wet-end replacement components for compatible Sandpiper flap-valve AODD pumps. Matching the exact model, pump construction, flap valve material and manufacturer part number helps maintenance engineers and purchasing teams identify the correct replacement component.\u003c\/p\u003e\n\u003cdiv class=\"sp-benefit-grid\"\u003e\n\u003cdiv class=\"sp-benefit-card\"\u003e\n\u003cdiv class=\"sp-benefit-number\"\u003e01\u003c\/div\u003e\n\u003ch4\u003eModel-Specific Compatibility\u003c\/h4\u003e\n\u003cp\u003eSelect according to the verified Sandpiper pump model and construction rather than nominal size alone.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sp-benefit-card\"\u003e\n\u003cdiv class=\"sp-benefit-number\"\u003e02\u003c\/div\u003e\n\u003ch4\u003eMaterial Selection\u003c\/h4\u003e\n\u003cp\u003eUse only manufacturer-listed flap valve materials for the applicable pump configuration.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sp-benefit-card\"\u003e\n\u003cdiv class=\"sp-benefit-number\"\u003e03\u003c\/div\u003e\n\u003ch4\u003eExact Part Identification\u003c\/h4\u003e\n\u003cp\u003eUse the Sandpiper manufacturer part number to support accurate maintenance and procurement.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sp-benefit-card\"\u003e\n\u003cdiv class=\"sp-benefit-number\"\u003e04\u003c\/div\u003e\n\u003ch4\u003eGenuine Sandpiper Replacement Part\u003c\/h4\u003e\n\u003cp\u003eMaintain compatible Sandpiper pumps using genuine manufacturer replacement components.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch3\u003eWhen Should HDF2\/HDF50 Flap Valves Be Inspected?\u003c\/h3\u003e\n\u003cp\u003eInspect the flap-valve area during planned wet-end maintenance and whenever check-valve operation requires investigation.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eThe flap valve shows visible wear, cuts, deformation or damage\u003c\/li\u003e\n\u003cli\u003eForeign material prevents the flap from closing correctly against the seat\u003c\/li\u003e\n\u003cli\u003eThe mating flap valve seat shows wear or damage\u003c\/li\u003e\n\u003cli\u003ePump priming, solids handling or check-valve sealing requires investigation\u003c\/li\u003e\n\u003cli\u003eThe pump is undergoing scheduled wet-end maintenance\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cdiv class=\"sp-faq\"\u003e\n\u003cdetails\u003e\u003csummary\u003eWhat is the Sandpiper HDF2\/HDF50 flap valve?\u003c\/summary\u003e\u003cp\u003eIt is the moving wet-end check-valve component used in compatible Sandpiper HDF2\/HDF50 flap-valve AODD pumps. It opens away from and closes against the flap valve seat as the pump cycles.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eIs the flap valve the same as the complete flap-valve system?\u003c\/summary\u003e\u003cp\u003eNo. The flap valve is the moving replacement component. The flap valve seat and related hinge, wear, retainer or sealing components are separate parts where Sandpiper lists them separately.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eWhich flap valve materials are listed for this HDF2\/HDF50?\u003c\/summary\u003e\u003cp\u003eThe manufacturer-listed selections shown on this page are Buna, FKM, EPDM, Neoprene, Urethane, Hytrel, Santoprene. Confirm the exact manufacturer part number and chemical compatibility before ordering.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eAre flap valve seats included with these flap valves?\u003c\/summary\u003e\u003cp\u003eDo not assume a flap valve seat is included with an individual flap valve part number. Sandpiper lists seats separately on applicable service-parts lists unless a specific kit or assembly states otherwise.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eHow do I confirm the correct HDF2\/HDF50 flap valve?\u003c\/summary\u003e\u003cp\u003eCheck the complete pump model and construction, identify the required flap valve material and verify the corresponding Sandpiper manufacturer part number against the current service manual.\u003c\/p\u003e\u003c\/details\u003e\n\u003c\/div\u003e\n\u003ch3 style=\"text-align:center;\"\u003eExplore Other Sandpiper Wet-End Parts\u003c\/h3\u003e\n\u003cdiv class=\"sp-related-grid\"\u003e\n\u003cdiv class=\"sp-related-card\"\u003e\n\u003cspan class=\"sp-related-label\"\u003eFlap Valves\u003c\/span\u003e\u003ch4\u003eAll Sandpiper AODD Pump Flap Valves\u003c\/h4\u003e\n\u003cp\u003eBrowse genuine Sandpiper flap valves by pump model, construction, material and manufacturer part number.\u003c\/p\u003e\n\u003ca href=\"\/collections\/sandpiper-aodd-pump-flap-valves\"\u003eView Collection →\u003c\/a\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sp-related-card\"\u003e\n\u003cspan class=\"sp-related-label\"\u003eBall Valve Parts\u003c\/span\u003e\u003ch4\u003eSandpiper AODD Pump Check Balls\u003c\/h4\u003e\n\u003cp\u003eLooking for a ball-type check-valve pump? Browse genuine Sandpiper AODD pump check balls.\u003c\/p\u003e\n\u003ca href=\"\/collections\/sandpiper-aodd-pump-check-balls\"\u003eView Collection →\u003c\/a\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sp-help-banner\"\u003e\n\u003cdiv\u003e\n\u003ch3\u003eNeed Help Selecting the Correct HDF2\/HDF50 Flap Valve?\u003c\/h3\u003e\n\u003cp\u003eSend ABS Engineering your complete Sandpiper HDF2\/HDF50 pump model, nameplate details, pump construction and existing flap valve part number for verification before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sp-cta-links\"\u003e\n\u003ca href=\"\/pages\/contact\"\u003eRequest a Quote\u003c\/a\u003e\u003ca href=\"\/pages\/contact\"\u003eRequest Part Verification\u003c\/a\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"SANDPIPER","offers":[{"title":"Buna","offer_id":53332586365109,"sku":"338.005.360","price":0.0,"currency_code":"MYR","in_stock":false},{"title":"FKM","offer_id":53332586397877,"sku":"338.005.363","price":0.0,"currency_code":"MYR","in_stock":false},{"title":"EPDM","offer_id":53332586430645,"sku":"338.005.364","price":0.0,"currency_code":"MYR","in_stock":false},{"title":"Neoprene","offer_id":53332586463413,"sku":"338.005.365","price":0.0,"currency_code":"MYR","in_stock":false},{"title":"Urethane","offer_id":53332586496181,"sku":"338.010.357","price":0.0,"currency_code":"MYR","in_stock":false},{"title":"Hytrel","offer_id":53332586528949,"sku":"338.010.356","price":0.0,"currency_code":"MYR","in_stock":false},{"title":"Santoprene","offer_id":53332586561717,"sku":"338.010.354","price":0.0,"currency_code":"MYR","in_stock":false}]},{"product_id":"sandpiper-hd20f-aodd-pump-flap-valves","title":"Sandpiper HD20F 2\" Heavy Duty AODD Pump Flap Valves for Non-Metallic Pumps","description":"\u003cdiv class=\"sp-flap-desc\"\u003e\n\u003cstyle\u003e.sp-flap-desc{--sp-blue:#1e3a8a;--sp-blue-light:#eef2ff;--sp-blue-soft:#f7f9ff;--sp-text:#2b2f38;--sp-muted:#626977;--sp-border:#e1e5ec;--sp-white:#fff;max-width:1100px;margin:0 auto;font-family:Arial,Helvetica,sans-serif;color:var(--sp-text);line-height:1.65}.sp-flap-desc *{box-sizing:border-box}.sp-flap-desc h2{color:var(--sp-blue);font-size:27px;line-height:1.3;margin:0 0 12px}.sp-flap-desc h3{color:var(--sp-blue);font-size:21px;line-height:1.35;margin:38px 0 14px}.sp-flap-desc h4{color:var(--sp-blue);font-size:15px;line-height:1.4;margin:0 0 8px}.sp-flap-desc p{margin:0 0 14px;font-size:15px}.sp-flap-desc ul{margin:0;padding-left:20px;font-size:15px}.sp-flap-desc li{margin-bottom:7px}.sp-eyebrow{display:inline-block;color:var(--sp-blue);background:var(--sp-blue-light);font-size:12px;font-weight:700;letter-spacing:.5px;text-transform:uppercase;padding:6px 11px;border-radius:20px;margin-bottom:12px}.sp-intro{font-size:16px!important;color:var(--sp-muted);max-width:880px;margin-bottom:22px!important}.sp-atomic-answer{font-size:16px!important;background:var(--sp-blue-soft);border-left:4px solid var(--sp-blue);padding:18px 20px;border-radius:0 8px 8px 0;margin:0 0 28px!important}.sp-overview-wrap{display:grid;grid-template-columns:minmax(0,2fr) minmax(240px,1fr);gap:28px;align-items:start;margin:24px 0 28px}.sp-ideal-for{background:var(--sp-blue-soft);border:1px solid #dfe5f5;border-radius:12px;padding:22px}.sp-ideal-for h4{font-size:16px;margin-bottom:12px}.sp-benefit-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:16px;margin:22px 0 38px}.sp-benefit-card{border:1px solid var(--sp-border);border-radius:10px;padding:20px;background:var(--sp-white)}.sp-benefit-number{width:30px;height:30px;display:flex;align-items:center;justify-content:center;background:var(--sp-blue-light);color:var(--sp-blue);border-radius:50%;font-size:13px;font-weight:700;margin-bottom:13px}.sp-benefit-card p{font-size:14px;color:var(--sp-muted);margin:0}.sp-table-wrap{overflow-x:auto;margin:18px 0 38px;border:1px solid var(--sp-border);border-radius:10px}.sp-spec-table,.sp-part-table{width:100%;border-collapse:collapse;font-size:14px;min-width:580px}.sp-spec-table th,.sp-spec-table td,.sp-part-table td{text-align:left;padding:13px 16px;border-bottom:1px solid var(--sp-border);vertical-align:top}.sp-spec-table th{width:34%;color:var(--sp-blue);background:#f8f9fc;font-weight:700}.sp-part-table th{background:var(--sp-blue);color:#fff;padding:12px 14px;text-align:left}.sp-part-table tr:nth-child(even) td{background:#f8f9fc}.sp-note{border-left:4px solid var(--sp-blue);background:var(--sp-blue-soft);padding:16px 18px;margin:18px 0 34px;border-radius:0 8px 8px 0;font-size:14px}.sp-faq{border-top:1px solid var(--sp-border);margin-bottom:36px}.sp-faq details{border-bottom:1px solid var(--sp-border)}.sp-faq summary{cursor:pointer;list-style:none;color:var(--sp-blue);font-size:15px;font-weight:700;padding:17px 34px 17px 4px;position:relative}.sp-faq summary::-webkit-details-marker{display:none}.sp-faq summary:after{content:'+';position:absolute;right:5px;top:14px;font-size:22px;font-weight:400}.sp-faq details[open] summary:after{content:'−'}.sp-faq details p{padding:0 4px 17px;color:var(--sp-muted);font-size:14px}.sp-related-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:16px;margin:20px 0 38px}.sp-related-card{border:1px solid var(--sp-border);border-radius:10px;padding:20px;background:#fff;display:flex;flex-direction:column;min-height:180px}.sp-related-label{display:inline-block;width:max-content;color:var(--sp-blue);background:var(--sp-blue-light);padding:5px 9px;border-radius:16px;font-size:11px;font-weight:700;margin-bottom:12px}.sp-related-card h4{font-size:16px;margin-bottom:8px}.sp-related-card p{color:var(--sp-muted);font-size:13px;flex-grow:1}.sp-related-card a{color:var(--sp-blue);font-size:13px;font-weight:700;text-decoration:none}.sp-help-banner{background:var(--sp-blue);color:#fff;border-radius:12px;padding:28px 30px;display:flex;justify-content:space-between;align-items:center;gap:24px;flex-wrap:wrap;margin-top:40px}.sp-help-banner h3{color:#fff;margin:0 0 7px;font-size:20px}.sp-help-banner p{color:#e4e9f8;font-size:14px;margin:0;max-width:660px}.sp-cta-links{display:flex;gap:10px;flex-wrap:wrap}.sp-cta-links a{background:#fff;color:var(--sp-blue);text-decoration:none;font-weight:700;font-size:14px;padding:12px 22px;border-radius:25px}@media(max-width:760px){.sp-flap-desc h2{font-size:23px}.sp-overview-wrap{grid-template-columns:1fr}.sp-cta-links{width:100%}.sp-cta-links a{width:100%;text-align:center}}\u003c\/style\u003e\n\u003cspan class=\"sp-eyebrow\"\u003eGenuine Sandpiper Replacement Part\u003c\/span\u003e\n\u003ch2\u003eSandpiper HD20F 2\" Heavy Duty AODD Pump Flap Valves for Non-Metallic Pumps\u003c\/h2\u003e\n\u003cp class=\"sp-intro\"\u003eGenuine Sandpiper flap valve replacement parts for compatible HD20F 2\" Non-Metallic AODD pumps. Pump construction identifies the compatible pump configuration; the flap valve material is selected separately from the manufacturer-listed options below.\u003c\/p\u003e\n\u003cp class=\"sp-atomic-answer\"\u003eThe \u003cstrong\u003eSandpiper HD20F flap valve\u003c\/strong\u003e is the moving wet-end check-valve component used in compatible flap-valve AODD pumps. It opens away from the flap valve seat to allow forward fluid movement and closes against the seat to restrict reverse flow. Select the replacement by exact pump model, pump construction, flap valve material and Sandpiper manufacturer part number.\u003c\/p\u003e\n\u003ch3\u003eProduct Overview\u003c\/h3\u003e\n\u003cdiv class=\"sp-overview-wrap\"\u003e\n\u003cdiv\u003e\n\u003cp\u003eThe \u003cstrong\u003eSandpiper HD20F flap valve\u003c\/strong\u003e is intended for servicing compatible 2\" Non-Metallic flap-valve AODD pumps.\u003c\/p\u003e\n\u003cp\u003eThe flap valve and its mating seat work together as a one-way wet-end check valve. The flap valve is the moving replacement component; the flap valve seat and related hinge, wear, retainer or sealing components are separate parts where Sandpiper lists them separately.\u003c\/p\u003e\n\u003cp\u003eManufacturer-listed flap valve selections for this product include \u003cstrong\u003eBuna-N, FKM, EPDM, Neoprene, Hytrel, Urethane\u003c\/strong\u003e. Select the exact material and manufacturer part number for the installed pump. Do not select the flap valve from nominal pump size or diaphragm material alone.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sp-ideal-for\"\u003e\n\u003ch4\u003eRecommended For\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eHeavy Duty Flap Valve wet-end maintenance\u003c\/li\u003e\n\u003cli\u003eReplacement of worn or damaged flap valves\u003c\/li\u003e\n\u003cli\u003eFlap check-valve inspection and servicing\u003c\/li\u003e\n\u003cli\u003eMaterial-specific replacement\u003c\/li\u003e\n\u003cli\u003eCritical maintenance spare-parts stock\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch3\u003eCompatibility \u0026amp; Product Details\u003c\/h3\u003e\n\u003cdiv class=\"sp-table-wrap\"\u003e\u003ctable class=\"sp-spec-table\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003ctd\u003eSandpiper\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCompatible Pump Model\u003c\/th\u003e\n\u003ctd\u003eHD20F\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePump Family\u003c\/th\u003e\n\u003ctd\u003eHeavy Duty Flap Valve AODD Pump\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eNominal Pump Size\u003c\/th\u003e\n\u003ctd\u003e2\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePart Type\u003c\/th\u003e\n\u003ctd\u003eFlap Valve\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCompatible Pump Construction\u003c\/th\u003e\n\u003ctd\u003eNon-Metallic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eManufacturer Manual Terminology\u003c\/th\u003e\n\u003ctd\u003eFlap Valve\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eShopify Variant Option\u003c\/th\u003e\n\u003ctd\u003eFlap Valve Material\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eManufacturer-Listed Pump Quantity\u003c\/th\u003e\n\u003ctd\u003e4 flap valves used per pump\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSelection Basis\u003c\/th\u003e\n\u003ctd\u003eExact pump model \/ pump construction \/ flap valve material \/ manufacturer part number\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003c\/div\u003e\n\u003ch3\u003eHow to Select the Correct HD20F Flap Valve\u003c\/h3\u003e\n\u003cp\u003eConfirm the complete pump identification before ordering. The pump model and construction establish the applicable flap-valve family, while the flap valve material must match the manufacturer-listed part number.\u003c\/p\u003e\n\u003cdiv class=\"sp-benefit-grid\"\u003e\n\u003cdiv class=\"sp-benefit-card\"\u003e\n\u003cdiv class=\"sp-benefit-number\"\u003e01\u003c\/div\u003e\n\u003ch4\u003eConfirm Pump Model\u003c\/h4\u003e\n\u003cp\u003eVerify the complete Sandpiper HD20F pump identification from the pump nameplate.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sp-benefit-card\"\u003e\n\u003cdiv class=\"sp-benefit-number\"\u003e02\u003c\/div\u003e\n\u003ch4\u003eConfirm Pump Construction\u003c\/h4\u003e\n\u003cp\u003eCheck that the installed pump matches the Non-Metallic construction covered by this product page.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sp-benefit-card\"\u003e\n\u003cdiv class=\"sp-benefit-number\"\u003e03\u003c\/div\u003e\n\u003ch4\u003eSelect Flap Valve Material\u003c\/h4\u003e\n\u003cp\u003eChoose only from manufacturer-listed flap valve materials for the applicable pump configuration.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sp-benefit-card\"\u003e\n\u003cdiv class=\"sp-benefit-number\"\u003e04\u003c\/div\u003e\n\u003ch4\u003eVerify Part Number\u003c\/h4\u003e\n\u003cp\u003eMatch the selected flap valve to the exact Sandpiper manufacturer part number in the current service manual.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch3\u003eSandpiper HD20F Flap Valve Part Numbers\u003c\/h3\u003e\n\u003cdiv class=\"sp-table-wrap\"\u003e\u003ctable class=\"sp-part-table\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eFlap Valve Material\u003c\/th\u003e\n\u003cth\u003eManufacturer Part Number\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBuna-N\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e338.005.360\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFKM\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e338.005.363\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEPDM\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e338.005.364\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNeoprene\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e338.005.365\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHytrel\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e338.010.356\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUrethane\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e338.010.357\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\n\u003cdiv class=\"sp-note\"\u003e\n\u003cstrong\u003eManufacturer Terminology Note:\u003c\/strong\u003e The applicable Sandpiper service manual identifies this replacement component as \u003cstrong\u003eFlap Valve\u003c\/strong\u003e. For consistent customer navigation, this Shopify listing uses “Flap Valve” as the primary spare-part name.\u003c\/div\u003e\n\u003cdiv class=\"sp-note\"\u003e\n\u003cstrong\u003eQuantity Note:\u003c\/strong\u003e The applicable Sandpiper repair-parts list shows four flap valves used in the pump. This is the installed pump quantity and does not confirm a commercial sales pack of four. Confirm supplied quantity before listing or ordering.\u003c\/div\u003e\n\u003cdiv class=\"sp-note\"\u003e\n\u003cstrong\u003eSelection Note:\u003c\/strong\u003e A flap valve is the moving check-valve component and should not be assumed to include the flap valve seat, hinge pad, wear pad, retainer or seals unless the exact manufacturer documentation states otherwise. Verify chemical compatibility and the exact manufacturer part number before ordering.\u003c\/div\u003e\n\u003ch3\u003eWhy Choose Genuine Sandpiper Flap Valves?\u003c\/h3\u003e\n\u003cp\u003eGenuine Sandpiper flap valves are manufacturer-listed wet-end replacement components for compatible Sandpiper flap-valve AODD pumps. Matching the exact model, pump construction, flap valve material and manufacturer part number helps maintenance engineers and purchasing teams identify the correct replacement component.\u003c\/p\u003e\n\u003cdiv class=\"sp-benefit-grid\"\u003e\n\u003cdiv class=\"sp-benefit-card\"\u003e\n\u003cdiv class=\"sp-benefit-number\"\u003e01\u003c\/div\u003e\n\u003ch4\u003eModel-Specific Compatibility\u003c\/h4\u003e\n\u003cp\u003eSelect according to the verified Sandpiper pump model and construction rather than nominal size alone.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sp-benefit-card\"\u003e\n\u003cdiv class=\"sp-benefit-number\"\u003e02\u003c\/div\u003e\n\u003ch4\u003eMaterial Selection\u003c\/h4\u003e\n\u003cp\u003eUse only manufacturer-listed flap valve materials for the applicable pump configuration.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sp-benefit-card\"\u003e\n\u003cdiv class=\"sp-benefit-number\"\u003e03\u003c\/div\u003e\n\u003ch4\u003eExact Part Identification\u003c\/h4\u003e\n\u003cp\u003eUse the Sandpiper manufacturer part number to support accurate maintenance and procurement.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sp-benefit-card\"\u003e\n\u003cdiv class=\"sp-benefit-number\"\u003e04\u003c\/div\u003e\n\u003ch4\u003eGenuine Sandpiper Replacement Part\u003c\/h4\u003e\n\u003cp\u003eMaintain compatible Sandpiper pumps using genuine manufacturer replacement components.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch3\u003eWhen Should HD20F Flap Valves Be Inspected?\u003c\/h3\u003e\n\u003cp\u003eInspect the flap-valve area during planned wet-end maintenance and whenever check-valve operation requires investigation.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eThe flap valve shows visible wear, cuts, deformation or damage\u003c\/li\u003e\n\u003cli\u003eForeign material prevents the flap from closing correctly against the seat\u003c\/li\u003e\n\u003cli\u003eThe mating flap valve seat shows wear or damage\u003c\/li\u003e\n\u003cli\u003ePump priming, solids handling or check-valve sealing requires investigation\u003c\/li\u003e\n\u003cli\u003eThe pump is undergoing scheduled wet-end maintenance\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cdiv class=\"sp-faq\"\u003e\n\u003cdetails\u003e\u003csummary\u003eWhat is the Sandpiper HD20F flap valve?\u003c\/summary\u003e\u003cp\u003eIt is the moving wet-end check-valve component used in compatible Sandpiper HD20F flap-valve AODD pumps. It opens away from and closes against the flap valve seat as the pump cycles.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eIs the flap valve the same as the complete flap-valve system?\u003c\/summary\u003e\u003cp\u003eNo. The flap valve is the moving replacement component. The flap valve seat and related hinge, wear, retainer or sealing components are separate parts where Sandpiper lists them separately.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eWhich flap valve materials are listed for this HD20F?\u003c\/summary\u003e\u003cp\u003eThe manufacturer-listed selections shown on this page are Buna-N, FKM, EPDM, Neoprene, Hytrel, Urethane. Confirm the exact manufacturer part number and chemical compatibility before ordering.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eAre flap valve seats included with these flap valves?\u003c\/summary\u003e\u003cp\u003eDo not assume a flap valve seat is included with an individual flap valve part number. Sandpiper lists seats separately on applicable service-parts lists unless a specific kit or assembly states otherwise.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eHow do I confirm the correct HD20F flap valve?\u003c\/summary\u003e\u003cp\u003eCheck the complete pump model and construction, identify the required flap valve material and verify the corresponding Sandpiper manufacturer part number against the current service manual.\u003c\/p\u003e\u003c\/details\u003e\n\u003c\/div\u003e\n\u003ch3 style=\"text-align:center;\"\u003eExplore Other Sandpiper Wet-End Parts\u003c\/h3\u003e\n\u003cdiv class=\"sp-related-grid\"\u003e\n\u003cdiv class=\"sp-related-card\"\u003e\n\u003cspan class=\"sp-related-label\"\u003eFlap Valves\u003c\/span\u003e\u003ch4\u003eAll Sandpiper AODD Pump Flap Valves\u003c\/h4\u003e\n\u003cp\u003eBrowse genuine Sandpiper flap valves by pump model, construction, material and manufacturer part number.\u003c\/p\u003e\n\u003ca href=\"\/collections\/sandpiper-aodd-pump-flap-valves\"\u003eView Collection →\u003c\/a\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sp-related-card\"\u003e\n\u003cspan class=\"sp-related-label\"\u003eBall Valve Parts\u003c\/span\u003e\u003ch4\u003eSandpiper AODD Pump Check Balls\u003c\/h4\u003e\n\u003cp\u003eLooking for a ball-type check-valve pump? Browse genuine Sandpiper AODD pump check balls.\u003c\/p\u003e\n\u003ca href=\"\/collections\/sandpiper-aodd-pump-check-balls\"\u003eView Collection →\u003c\/a\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sp-help-banner\"\u003e\n\u003cdiv\u003e\n\u003ch3\u003eNeed Help Selecting the Correct HD20F Flap Valve?\u003c\/h3\u003e\n\u003cp\u003eSend ABS Engineering your complete Sandpiper HD20F pump model, nameplate details, pump construction and existing flap valve part number for verification before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sp-cta-links\"\u003e\n\u003ca href=\"\/pages\/contact\"\u003eRequest a Quote\u003c\/a\u003e\u003ca href=\"\/pages\/contact\"\u003eRequest Part Verification\u003c\/a\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"SANDPIPER","offers":[{"title":"Buna-N","offer_id":53332607697077,"sku":"338.005.360","price":0.0,"currency_code":"MYR","in_stock":false},{"title":"FKM","offer_id":53332607729845,"sku":"338.005.363","price":0.0,"currency_code":"MYR","in_stock":false},{"title":"EPDM","offer_id":53332607762613,"sku":"338.005.364","price":0.0,"currency_code":"MYR","in_stock":false},{"title":"Neoprene","offer_id":53332607795381,"sku":"338.005.365","price":0.0,"currency_code":"MYR","in_stock":false},{"title":"Hytrel","offer_id":53332607828149,"sku":"338.010.356","price":0.0,"currency_code":"MYR","in_stock":false},{"title":"Urethane","offer_id":53332607860917,"sku":"338.010.357","price":0.0,"currency_code":"MYR","in_stock":false}]},{"product_id":"sandpiper-hdf3-hdf4-aodd-pump-flap-valves","title":"Sandpiper HDF3\/HDF4 3\"\/4\" Heavy Duty AODD Pump Flap Valves for Metallic Pumps","description":"\u003cdiv class=\"sp-flap-desc\"\u003e\n\u003cstyle\u003e.sp-flap-desc{--sp-blue:#1e3a8a;--sp-blue-light:#eef2ff;--sp-blue-soft:#f7f9ff;--sp-text:#2b2f38;--sp-muted:#626977;--sp-border:#e1e5ec;--sp-white:#fff;max-width:1100px;margin:0 auto;font-family:Arial,Helvetica,sans-serif;color:var(--sp-text);line-height:1.65}.sp-flap-desc *{box-sizing:border-box}.sp-flap-desc h2{color:var(--sp-blue);font-size:27px;line-height:1.3;margin:0 0 12px}.sp-flap-desc h3{color:var(--sp-blue);font-size:21px;line-height:1.35;margin:38px 0 14px}.sp-flap-desc h4{color:var(--sp-blue);font-size:15px;line-height:1.4;margin:0 0 8px}.sp-flap-desc p{margin:0 0 14px;font-size:15px}.sp-flap-desc ul{margin:0;padding-left:20px;font-size:15px}.sp-flap-desc li{margin-bottom:7px}.sp-eyebrow{display:inline-block;color:var(--sp-blue);background:var(--sp-blue-light);font-size:12px;font-weight:700;letter-spacing:.5px;text-transform:uppercase;padding:6px 11px;border-radius:20px;margin-bottom:12px}.sp-intro{font-size:16px!important;color:var(--sp-muted);max-width:880px;margin-bottom:22px!important}.sp-atomic-answer{font-size:16px!important;background:var(--sp-blue-soft);border-left:4px solid var(--sp-blue);padding:18px 20px;border-radius:0 8px 8px 0;margin:0 0 28px!important}.sp-overview-wrap{display:grid;grid-template-columns:minmax(0,2fr) minmax(240px,1fr);gap:28px;align-items:start;margin:24px 0 28px}.sp-ideal-for{background:var(--sp-blue-soft);border:1px solid #dfe5f5;border-radius:12px;padding:22px}.sp-ideal-for h4{font-size:16px;margin-bottom:12px}.sp-benefit-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:16px;margin:22px 0 38px}.sp-benefit-card{border:1px solid var(--sp-border);border-radius:10px;padding:20px;background:var(--sp-white)}.sp-benefit-number{width:30px;height:30px;display:flex;align-items:center;justify-content:center;background:var(--sp-blue-light);color:var(--sp-blue);border-radius:50%;font-size:13px;font-weight:700;margin-bottom:13px}.sp-benefit-card p{font-size:14px;color:var(--sp-muted);margin:0}.sp-table-wrap{overflow-x:auto;margin:18px 0 38px;border:1px solid var(--sp-border);border-radius:10px}.sp-spec-table,.sp-part-table{width:100%;border-collapse:collapse;font-size:14px;min-width:580px}.sp-spec-table th,.sp-spec-table td,.sp-part-table td{text-align:left;padding:13px 16px;border-bottom:1px solid var(--sp-border);vertical-align:top}.sp-spec-table th{width:34%;color:var(--sp-blue);background:#f8f9fc;font-weight:700}.sp-part-table th{background:var(--sp-blue);color:#fff;padding:12px 14px;text-align:left}.sp-part-table tr:nth-child(even) td{background:#f8f9fc}.sp-note{border-left:4px solid var(--sp-blue);background:var(--sp-blue-soft);padding:16px 18px;margin:18px 0 34px;border-radius:0 8px 8px 0;font-size:14px}.sp-faq{border-top:1px solid var(--sp-border);margin-bottom:36px}.sp-faq details{border-bottom:1px solid var(--sp-border)}.sp-faq summary{cursor:pointer;list-style:none;color:var(--sp-blue);font-size:15px;font-weight:700;padding:17px 34px 17px 4px;position:relative}.sp-faq summary::-webkit-details-marker{display:none}.sp-faq summary:after{content:'+';position:absolute;right:5px;top:14px;font-size:22px;font-weight:400}.sp-faq details[open] summary:after{content:'−'}.sp-faq details p{padding:0 4px 17px;color:var(--sp-muted);font-size:14px}.sp-related-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:16px;margin:20px 0 38px}.sp-related-card{border:1px solid var(--sp-border);border-radius:10px;padding:20px;background:#fff;display:flex;flex-direction:column;min-height:180px}.sp-related-label{display:inline-block;width:max-content;color:var(--sp-blue);background:var(--sp-blue-light);padding:5px 9px;border-radius:16px;font-size:11px;font-weight:700;margin-bottom:12px}.sp-related-card h4{font-size:16px;margin-bottom:8px}.sp-related-card p{color:var(--sp-muted);font-size:13px;flex-grow:1}.sp-related-card a{color:var(--sp-blue);font-size:13px;font-weight:700;text-decoration:none}.sp-help-banner{background:var(--sp-blue);color:#fff;border-radius:12px;padding:28px 30px;display:flex;justify-content:space-between;align-items:center;gap:24px;flex-wrap:wrap;margin-top:40px}.sp-help-banner h3{color:#fff;margin:0 0 7px;font-size:20px}.sp-help-banner p{color:#e4e9f8;font-size:14px;margin:0;max-width:660px}.sp-cta-links{display:flex;gap:10px;flex-wrap:wrap}.sp-cta-links a{background:#fff;color:var(--sp-blue);text-decoration:none;font-weight:700;font-size:14px;padding:12px 22px;border-radius:25px}@media(max-width:760px){.sp-flap-desc h2{font-size:23px}.sp-overview-wrap{grid-template-columns:1fr}.sp-cta-links{width:100%}.sp-cta-links a{width:100%;text-align:center}}\u003c\/style\u003e\n\u003cspan class=\"sp-eyebrow\"\u003eGenuine Sandpiper Replacement Part\u003c\/span\u003e\n\u003ch2\u003eSandpiper HDF3\/HDF4 3\"\/4\" Heavy Duty AODD Pump Flap Valves for Metallic Pumps\u003c\/h2\u003e\n\u003cp class=\"sp-intro\"\u003eGenuine Sandpiper flap valve replacement parts for compatible HDF3\/HDF4 3\"\/4\" Metallic AODD pumps. Pump construction identifies the compatible pump configuration; the flap valve material is selected separately from the manufacturer-listed options below.\u003c\/p\u003e\n\u003cp class=\"sp-atomic-answer\"\u003eThe \u003cstrong\u003eSandpiper HDF3\/HDF4 flap valve\u003c\/strong\u003e is the moving wet-end check-valve component used in compatible flap-valve AODD pumps. It opens away from the flap valve seat to allow forward fluid movement and closes against the seat to restrict reverse flow. Select the replacement by exact pump model, pump construction, flap valve material and Sandpiper manufacturer part number.\u003c\/p\u003e\n\u003ch3\u003eProduct Overview\u003c\/h3\u003e\n\u003cdiv class=\"sp-overview-wrap\"\u003e\n\u003cdiv\u003e\n\u003cp\u003eThe \u003cstrong\u003eSandpiper HDF3\/HDF4 flap valve\u003c\/strong\u003e is intended for servicing compatible 3\"\/4\" Metallic flap-valve AODD pumps.\u003c\/p\u003e\n\u003cp\u003eThe flap valve and its mating seat work together as a one-way wet-end check valve. The flap valve is the moving replacement component; the flap valve seat and related hinge, wear, retainer or sealing components are separate parts where Sandpiper lists them separately.\u003c\/p\u003e\n\u003cp\u003eManufacturer-listed flap valve selections for this product include \u003cstrong\u003eBuna, Neoprene, Santoprene, Hytrel, Urethane\u003c\/strong\u003e. Select the exact material and manufacturer part number for the installed pump. Do not select the flap valve from nominal pump size or diaphragm material alone.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sp-ideal-for\"\u003e\n\u003ch4\u003eRecommended For\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eHeavy Duty Flap Valve wet-end maintenance\u003c\/li\u003e\n\u003cli\u003eReplacement of worn or damaged flap valves\u003c\/li\u003e\n\u003cli\u003eFlap check-valve inspection and servicing\u003c\/li\u003e\n\u003cli\u003eMaterial-specific replacement\u003c\/li\u003e\n\u003cli\u003eCritical maintenance spare-parts stock\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch3\u003eCompatibility \u0026amp; Product Details\u003c\/h3\u003e\n\u003cdiv class=\"sp-table-wrap\"\u003e\u003ctable class=\"sp-spec-table\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003ctd\u003eSandpiper\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCompatible Pump Model\u003c\/th\u003e\n\u003ctd\u003eHDF3\/HDF4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePump Family\u003c\/th\u003e\n\u003ctd\u003eHeavy Duty Flap Valve AODD Pump\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eNominal Pump Size\u003c\/th\u003e\n\u003ctd\u003e3\"\/4\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePart Type\u003c\/th\u003e\n\u003ctd\u003eFlap Valve\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCompatible Pump Construction\u003c\/th\u003e\n\u003ctd\u003eMetallic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eManufacturer Manual Terminology\u003c\/th\u003e\n\u003ctd\u003eValve, Flap Assembly\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eShopify Variant Option\u003c\/th\u003e\n\u003ctd\u003eFlap Valve Material\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eManufacturer-Listed Pump Quantity\u003c\/th\u003e\n\u003ctd\u003e4 flap valves used per pump\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSelection Basis\u003c\/th\u003e\n\u003ctd\u003eExact pump model \/ pump construction \/ flap valve material \/ manufacturer part number\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003c\/div\u003e\n\u003ch3\u003eHow to Select the Correct HDF3\/HDF4 Flap Valve\u003c\/h3\u003e\n\u003cp\u003eConfirm the complete pump identification before ordering. The pump model and construction establish the applicable flap-valve family, while the flap valve material must match the manufacturer-listed part number.\u003c\/p\u003e\n\u003cdiv class=\"sp-benefit-grid\"\u003e\n\u003cdiv class=\"sp-benefit-card\"\u003e\n\u003cdiv class=\"sp-benefit-number\"\u003e01\u003c\/div\u003e\n\u003ch4\u003eConfirm Pump Model\u003c\/h4\u003e\n\u003cp\u003eVerify the complete Sandpiper HDF3\/HDF4 pump identification from the pump nameplate.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sp-benefit-card\"\u003e\n\u003cdiv class=\"sp-benefit-number\"\u003e02\u003c\/div\u003e\n\u003ch4\u003eConfirm Pump Construction\u003c\/h4\u003e\n\u003cp\u003eCheck that the installed pump matches the Metallic construction covered by this product page.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sp-benefit-card\"\u003e\n\u003cdiv class=\"sp-benefit-number\"\u003e03\u003c\/div\u003e\n\u003ch4\u003eSelect Flap Valve Material\u003c\/h4\u003e\n\u003cp\u003eChoose only from manufacturer-listed flap valve materials for the applicable pump configuration.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sp-benefit-card\"\u003e\n\u003cdiv class=\"sp-benefit-number\"\u003e04\u003c\/div\u003e\n\u003ch4\u003eVerify Part Number\u003c\/h4\u003e\n\u003cp\u003eMatch the selected flap valve to the exact Sandpiper manufacturer part number in the current service manual.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch3\u003eSandpiper HDF3\/HDF4 Flap Valve Part Numbers\u003c\/h3\u003e\n\u003cdiv class=\"sp-table-wrap\"\u003e\u003ctable class=\"sp-part-table\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eFlap Valve Material\u003c\/th\u003e\n\u003cth\u003eManufacturer Part Number\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eBuna\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e338.008.360\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eNeoprene\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e338.008.365\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSantoprene\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e338.011.354\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eHytrel\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e338.011.356\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eUrethane\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e338.011.357\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\n\u003cdiv class=\"sp-note\"\u003e\n\u003cstrong\u003eManufacturer Terminology Note:\u003c\/strong\u003e The applicable Sandpiper service manual identifies this replacement component as \u003cstrong\u003eValve, Flap Assembly\u003c\/strong\u003e. For consistent customer navigation, this Shopify listing uses “Flap Valve” as the primary spare-part name.\u003c\/div\u003e\n\u003cdiv class=\"sp-note\"\u003e\n\u003cstrong\u003eQuantity Note:\u003c\/strong\u003e The applicable Sandpiper repair-parts list shows four flap valves used in the pump. This is the installed pump quantity and does not confirm a commercial sales pack of four. Confirm supplied quantity before listing or ordering.\u003c\/div\u003e\n\u003cdiv class=\"sp-note\"\u003e\n\u003cstrong\u003eSelection Note:\u003c\/strong\u003e A flap valve is the moving check-valve component and should not be assumed to include the flap valve seat, hinge pad, wear pad, retainer or seals unless the exact manufacturer documentation states otherwise. Verify chemical compatibility and the exact manufacturer part number before ordering.\u003c\/div\u003e\n\u003ch3\u003eWhy Choose Genuine Sandpiper Flap Valves?\u003c\/h3\u003e\n\u003cp\u003eGenuine Sandpiper flap valves are manufacturer-listed wet-end replacement components for compatible Sandpiper flap-valve AODD pumps. Matching the exact model, pump construction, flap valve material and manufacturer part number helps maintenance engineers and purchasing teams identify the correct replacement component.\u003c\/p\u003e\n\u003cdiv class=\"sp-benefit-grid\"\u003e\n\u003cdiv class=\"sp-benefit-card\"\u003e\n\u003cdiv class=\"sp-benefit-number\"\u003e01\u003c\/div\u003e\n\u003ch4\u003eModel-Specific Compatibility\u003c\/h4\u003e\n\u003cp\u003eSelect according to the verified Sandpiper pump model and construction rather than nominal size alone.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sp-benefit-card\"\u003e\n\u003cdiv class=\"sp-benefit-number\"\u003e02\u003c\/div\u003e\n\u003ch4\u003eMaterial Selection\u003c\/h4\u003e\n\u003cp\u003eUse only manufacturer-listed flap valve materials for the applicable pump configuration.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sp-benefit-card\"\u003e\n\u003cdiv class=\"sp-benefit-number\"\u003e03\u003c\/div\u003e\n\u003ch4\u003eExact Part Identification\u003c\/h4\u003e\n\u003cp\u003eUse the Sandpiper manufacturer part number to support accurate maintenance and procurement.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sp-benefit-card\"\u003e\n\u003cdiv class=\"sp-benefit-number\"\u003e04\u003c\/div\u003e\n\u003ch4\u003eGenuine Sandpiper Replacement Part\u003c\/h4\u003e\n\u003cp\u003eMaintain compatible Sandpiper pumps using genuine manufacturer replacement components.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch3\u003eWhen Should HDF3\/HDF4 Flap Valves Be Inspected?\u003c\/h3\u003e\n\u003cp\u003eInspect the flap-valve area during planned wet-end maintenance and whenever check-valve operation requires investigation.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eThe flap valve shows visible wear, cuts, deformation or damage\u003c\/li\u003e\n\u003cli\u003eForeign material prevents the flap from closing correctly against the seat\u003c\/li\u003e\n\u003cli\u003eThe mating flap valve seat shows wear or damage\u003c\/li\u003e\n\u003cli\u003ePump priming, solids handling or check-valve sealing requires investigation\u003c\/li\u003e\n\u003cli\u003eThe pump is undergoing scheduled wet-end maintenance\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cdiv class=\"sp-faq\"\u003e\n\u003cdetails\u003e\u003csummary\u003eWhat is the Sandpiper HDF3\/HDF4 flap valve?\u003c\/summary\u003e\u003cp\u003eIt is the moving wet-end check-valve component used in compatible Sandpiper HDF3\/HDF4 flap-valve AODD pumps. It opens away from and closes against the flap valve seat as the pump cycles.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eIs the flap valve the same as the complete flap-valve system?\u003c\/summary\u003e\u003cp\u003eNo. The flap valve is the moving replacement component. The flap valve seat and related hinge, wear, retainer or sealing components are separate parts where Sandpiper lists them separately.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eWhich flap valve materials are listed for this HDF3\/HDF4?\u003c\/summary\u003e\u003cp\u003eThe manufacturer-listed selections shown on this page are Buna, Neoprene, Santoprene, Hytrel, Urethane. Confirm the exact manufacturer part number and chemical compatibility before ordering.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eAre flap valve seats included with these flap valves?\u003c\/summary\u003e\u003cp\u003eDo not assume a flap valve seat is included with an individual flap valve part number. Sandpiper lists seats separately on applicable service-parts lists unless a specific kit or assembly states otherwise.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eHow do I confirm the correct HDF3\/HDF4 flap valve?\u003c\/summary\u003e\u003cp\u003eCheck the complete pump model and construction, identify the required flap valve material and verify the corresponding Sandpiper manufacturer part number against the current service manual.\u003c\/p\u003e\u003c\/details\u003e\n\u003c\/div\u003e\n\u003ch3 style=\"text-align:center;\"\u003eExplore Other Sandpiper Wet-End Parts\u003c\/h3\u003e\n\u003cdiv class=\"sp-related-grid\"\u003e\n\u003cdiv class=\"sp-related-card\"\u003e\n\u003cspan class=\"sp-related-label\"\u003eFlap Valves\u003c\/span\u003e\u003ch4\u003eAll Sandpiper AODD Pump Flap Valves\u003c\/h4\u003e\n\u003cp\u003eBrowse genuine Sandpiper flap valves by pump model, construction, material and manufacturer part number.\u003c\/p\u003e\n\u003ca href=\"\/collections\/sandpiper-aodd-pump-flap-valves\"\u003eView Collection →\u003c\/a\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sp-related-card\"\u003e\n\u003cspan class=\"sp-related-label\"\u003eBall Valve Parts\u003c\/span\u003e\u003ch4\u003eSandpiper AODD Pump Check Balls\u003c\/h4\u003e\n\u003cp\u003eLooking for a ball-type check-valve pump? Browse genuine Sandpiper AODD pump check balls.\u003c\/p\u003e\n\u003ca href=\"\/collections\/sandpiper-aodd-pump-check-balls\"\u003eView Collection →\u003c\/a\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sp-help-banner\"\u003e\n\u003cdiv\u003e\n\u003ch3\u003eNeed Help Selecting the Correct HDF3\/HDF4 Flap Valve?\u003c\/h3\u003e\n\u003cp\u003eSend ABS Engineering your complete Sandpiper HDF3\/HDF4 pump model, nameplate details, pump construction and existing flap valve part number for verification before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sp-cta-links\"\u003e\n\u003ca href=\"\/pages\/contact\"\u003eRequest a Quote\u003c\/a\u003e\u003ca href=\"\/pages\/contact\"\u003eRequest Part Verification\u003c\/a\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"SANDPIPER","offers":[{"title":"Buna","offer_id":53332628013237,"sku":"338.008.360","price":0.0,"currency_code":"MYR","in_stock":false},{"title":"Neoprene","offer_id":53332628046005,"sku":"338.008.365","price":0.0,"currency_code":"MYR","in_stock":false},{"title":"Santoprene","offer_id":53332628078773,"sku":"338.011.354","price":0.0,"currency_code":"MYR","in_stock":false},{"title":"Hytrel","offer_id":53332628111541,"sku":"338.011.356","price":0.0,"currency_code":"MYR","in_stock":false},{"title":"Urethane","offer_id":53332628144309,"sku":"338.011.357","price":0.0,"currency_code":"MYR","in_stock":false}]},{"product_id":"sandpiper-spb20-non-metallic-aodd-pump-flap-valve","title":"Sandpiper SPB20 2\" Heavy Duty AODD Pump Flap Valve for Non-Metallic Pumps","description":"\u003cdiv class=\"sp-flap-desc\"\u003e\n\u003cstyle\u003e.sp-flap-desc{--sp-blue:#1e3a8a;--sp-blue-light:#eef2ff;--sp-blue-soft:#f7f9ff;--sp-text:#2b2f38;--sp-muted:#626977;--sp-border:#e1e5ec;--sp-white:#fff;max-width:1100px;margin:0 auto;font-family:Arial,Helvetica,sans-serif;color:var(--sp-text);line-height:1.65}.sp-flap-desc *{box-sizing:border-box}.sp-flap-desc h2{color:var(--sp-blue);font-size:27px;line-height:1.3;margin:0 0 12px}.sp-flap-desc h3{color:var(--sp-blue);font-size:21px;line-height:1.35;margin:38px 0 14px}.sp-flap-desc h4{color:var(--sp-blue);font-size:15px;line-height:1.4;margin:0 0 8px}.sp-flap-desc p{margin:0 0 14px;font-size:15px}.sp-flap-desc ul{margin:0;padding-left:20px;font-size:15px}.sp-flap-desc li{margin-bottom:7px}.sp-eyebrow{display:inline-block;color:var(--sp-blue);background:var(--sp-blue-light);font-size:12px;font-weight:700;letter-spacing:.5px;text-transform:uppercase;padding:6px 11px;border-radius:20px;margin-bottom:12px}.sp-intro{font-size:16px!important;color:var(--sp-muted);max-width:880px;margin-bottom:22px!important}.sp-atomic-answer{font-size:16px!important;background:var(--sp-blue-soft);border-left:4px solid var(--sp-blue);padding:18px 20px;border-radius:0 8px 8px 0;margin:0 0 28px!important}.sp-overview-wrap{display:grid;grid-template-columns:minmax(0,2fr) minmax(240px,1fr);gap:28px;align-items:start;margin:24px 0 28px}.sp-ideal-for{background:var(--sp-blue-soft);border:1px solid #dfe5f5;border-radius:12px;padding:22px}.sp-ideal-for h4{font-size:16px;margin-bottom:12px}.sp-benefit-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:16px;margin:22px 0 38px}.sp-benefit-card{border:1px solid var(--sp-border);border-radius:10px;padding:20px;background:var(--sp-white)}.sp-benefit-number{width:30px;height:30px;display:flex;align-items:center;justify-content:center;background:var(--sp-blue-light);color:var(--sp-blue);border-radius:50%;font-size:13px;font-weight:700;margin-bottom:13px}.sp-benefit-card p{font-size:14px;color:var(--sp-muted);margin:0}.sp-table-wrap{overflow-x:auto;margin:18px 0 38px;border:1px solid var(--sp-border);border-radius:10px}.sp-spec-table,.sp-part-table{width:100%;border-collapse:collapse;font-size:14px;min-width:580px}.sp-spec-table th,.sp-spec-table td,.sp-part-table td{text-align:left;padding:13px 16px;border-bottom:1px solid var(--sp-border);vertical-align:top}.sp-spec-table th{width:34%;color:var(--sp-blue);background:#f8f9fc;font-weight:700}.sp-part-table th{background:var(--sp-blue);color:#fff;padding:12px 14px;text-align:left}.sp-part-table tr:nth-child(even) td{background:#f8f9fc}.sp-note{border-left:4px solid var(--sp-blue);background:var(--sp-blue-soft);padding:16px 18px;margin:18px 0 34px;border-radius:0 8px 8px 0;font-size:14px}.sp-faq{border-top:1px solid var(--sp-border);margin-bottom:36px}.sp-faq details{border-bottom:1px solid var(--sp-border)}.sp-faq summary{cursor:pointer;list-style:none;color:var(--sp-blue);font-size:15px;font-weight:700;padding:17px 34px 17px 4px;position:relative}.sp-faq summary::-webkit-details-marker{display:none}.sp-faq summary:after{content:'+';position:absolute;right:5px;top:14px;font-size:22px;font-weight:400}.sp-faq details[open] summary:after{content:'−'}.sp-faq details p{padding:0 4px 17px;color:var(--sp-muted);font-size:14px}.sp-related-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:16px;margin:20px 0 38px}.sp-related-card{border:1px solid var(--sp-border);border-radius:10px;padding:20px;background:#fff;display:flex;flex-direction:column;min-height:180px}.sp-related-label{display:inline-block;width:max-content;color:var(--sp-blue);background:var(--sp-blue-light);padding:5px 9px;border-radius:16px;font-size:11px;font-weight:700;margin-bottom:12px}.sp-related-card h4{font-size:16px;margin-bottom:8px}.sp-related-card p{color:var(--sp-muted);font-size:13px;flex-grow:1}.sp-related-card a{color:var(--sp-blue);font-size:13px;font-weight:700;text-decoration:none}.sp-help-banner{background:var(--sp-blue);color:#fff;border-radius:12px;padding:28px 30px;display:flex;justify-content:space-between;align-items:center;gap:24px;flex-wrap:wrap;margin-top:40px}.sp-help-banner h3{color:#fff;margin:0 0 7px;font-size:20px}.sp-help-banner p{color:#e4e9f8;font-size:14px;margin:0;max-width:660px}.sp-cta-links{display:flex;gap:10px;flex-wrap:wrap}.sp-cta-links a{background:#fff;color:var(--sp-blue);text-decoration:none;font-weight:700;font-size:14px;padding:12px 22px;border-radius:25px}@media(max-width:760px){.sp-flap-desc h2{font-size:23px}.sp-overview-wrap{grid-template-columns:1fr}.sp-cta-links{width:100%}.sp-cta-links a{width:100%;text-align:center}}\u003c\/style\u003e\n\u003cspan class=\"sp-eyebrow\"\u003eGenuine Sandpiper Replacement Part\u003c\/span\u003e\n\u003ch2\u003eSandpiper SPB20 2\" Heavy Duty AODD Pump Flap Valve for Non-Metallic Pumps\u003c\/h2\u003e\n\u003cp class=\"sp-intro\"\u003eGenuine Sandpiper flap valve replacement parts for compatible SPB20 2\" Non-Metallic AODD pumps. Pump construction identifies the compatible pump configuration; the flap valve material is selected separately from the manufacturer-listed options below.\u003c\/p\u003e\n\u003cp class=\"sp-atomic-answer\"\u003eThe \u003cstrong\u003eSandpiper SPB20 flap valve\u003c\/strong\u003e is the moving wet-end check-valve component used in compatible flap-valve AODD pumps. It opens away from the flap valve seat to allow forward fluid movement and closes against the seat to restrict reverse flow. Select the replacement by exact pump model, pump construction, flap valve material and Sandpiper manufacturer part number.\u003c\/p\u003e\n\u003ch3\u003eProduct Overview\u003c\/h3\u003e\n\u003cdiv class=\"sp-overview-wrap\"\u003e\n\u003cdiv\u003e\n\u003cp\u003eThe \u003cstrong\u003eSandpiper SPB20 flap valve\u003c\/strong\u003e is intended for servicing compatible 2\" Non-Metallic flap-valve AODD pumps.\u003c\/p\u003e\n\u003cp\u003eThe flap valve and its mating seat work together as a one-way wet-end check valve. The flap valve is the moving replacement component; the flap valve seat and related hinge, wear, retainer or sealing components are separate parts where Sandpiper lists them separately.\u003c\/p\u003e\n\u003cp\u003eManufacturer-listed flap valve selections for this product include \u003cstrong\u003e316 Stainless Steel\u003c\/strong\u003e. Select the exact material and manufacturer part number for the installed pump. Do not select the flap valve from nominal pump size or diaphragm material alone.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sp-ideal-for\"\u003e\n\u003ch4\u003eRecommended For\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eHeavy Duty Flap Valve wet-end maintenance\u003c\/li\u003e\n\u003cli\u003eReplacement of worn or damaged flap valves\u003c\/li\u003e\n\u003cli\u003eFlap check-valve inspection and servicing\u003c\/li\u003e\n\u003cli\u003eMaterial-specific replacement\u003c\/li\u003e\n\u003cli\u003eCritical maintenance spare-parts stock\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch3\u003eCompatibility \u0026amp; Product Details\u003c\/h3\u003e\n\u003cdiv class=\"sp-table-wrap\"\u003e\u003ctable class=\"sp-spec-table\"\u003e\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003ctd\u003eSandpiper\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCompatible Pump Model\u003c\/th\u003e\n\u003ctd\u003eSPB20\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePump Family\u003c\/th\u003e\n\u003ctd\u003eHeavy Duty Flap Valve AODD Pump\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eNominal Pump Size\u003c\/th\u003e\n\u003ctd\u003e2\"\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003ePart Type\u003c\/th\u003e\n\u003ctd\u003eFlap Valve\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eCompatible Pump Construction\u003c\/th\u003e\n\u003ctd\u003eNon-Metallic\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eManufacturer Manual Terminology\u003c\/th\u003e\n\u003ctd\u003eFlap Valve\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eShopify Variant Option\u003c\/th\u003e\n\u003ctd\u003eFlap Valve Material\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eManufacturer-Listed Pump Quantity\u003c\/th\u003e\n\u003ctd\u003e4 flap valves used per pump\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth\u003eSelection Basis\u003c\/th\u003e\n\u003ctd\u003eExact pump model \/ pump construction \/ flap valve material \/ manufacturer part number\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\u003c\/table\u003e\u003c\/div\u003e\n\u003ch3\u003eHow to Select the Correct SPB20 Flap Valve\u003c\/h3\u003e\n\u003cp\u003eConfirm the complete pump identification before ordering. The pump model and construction establish the applicable flap-valve family, while the flap valve material must match the manufacturer-listed part number.\u003c\/p\u003e\n\u003cdiv class=\"sp-benefit-grid\"\u003e\n\u003cdiv class=\"sp-benefit-card\"\u003e\n\u003cdiv class=\"sp-benefit-number\"\u003e01\u003c\/div\u003e\n\u003ch4\u003eConfirm Pump Model\u003c\/h4\u003e\n\u003cp\u003eVerify the complete Sandpiper SPB20 pump identification from the pump nameplate.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sp-benefit-card\"\u003e\n\u003cdiv class=\"sp-benefit-number\"\u003e02\u003c\/div\u003e\n\u003ch4\u003eConfirm Pump Construction\u003c\/h4\u003e\n\u003cp\u003eCheck that the installed pump matches the Non-Metallic construction covered by this product page.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sp-benefit-card\"\u003e\n\u003cdiv class=\"sp-benefit-number\"\u003e03\u003c\/div\u003e\n\u003ch4\u003eSelect Flap Valve Material\u003c\/h4\u003e\n\u003cp\u003eChoose only from manufacturer-listed flap valve materials for the applicable pump configuration.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sp-benefit-card\"\u003e\n\u003cdiv class=\"sp-benefit-number\"\u003e04\u003c\/div\u003e\n\u003ch4\u003eVerify Part Number\u003c\/h4\u003e\n\u003cp\u003eMatch the selected flap valve to the exact Sandpiper manufacturer part number in the current service manual.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch3\u003eSandpiper SPB20 Flap Valve Part Numbers\u003c\/h3\u003e\n\u003cdiv class=\"sp-table-wrap\"\u003e\u003ctable class=\"sp-part-table\"\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eFlap Valve Material\u003c\/th\u003e\n\u003cth\u003eManufacturer Part Number\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\u003ctr\u003e\n\u003ctd\u003e316 Stainless Steel\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003e338.016.110\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\u003c\/tbody\u003e\n\u003c\/table\u003e\u003c\/div\u003e\n\u003cdiv class=\"sp-note\"\u003e\n\u003cstrong\u003eManufacturer Terminology Note:\u003c\/strong\u003e The applicable Sandpiper service manual identifies this replacement component as \u003cstrong\u003eFlap Valve\u003c\/strong\u003e. For consistent customer navigation, this Shopify listing uses “Flap Valve” as the primary spare-part name.\u003c\/div\u003e\n\u003cdiv class=\"sp-note\"\u003e\n\u003cstrong\u003eQuantity Note:\u003c\/strong\u003e The applicable Sandpiper repair-parts list shows four flap valves used in the pump. This is the installed pump quantity and does not confirm a commercial sales pack of four. Confirm supplied quantity before listing or ordering.\u003c\/div\u003e\n\u003cdiv class=\"sp-note\"\u003e\n\u003cstrong\u003eSelection Note:\u003c\/strong\u003e A flap valve is the moving check-valve component and should not be assumed to include the flap valve seat, hinge pad, wear pad, retainer or seals unless the exact manufacturer documentation states otherwise. Verify chemical compatibility and the exact manufacturer part number before ordering.\u003c\/div\u003e\n\u003ch3\u003eWhy Choose Genuine Sandpiper Flap Valves?\u003c\/h3\u003e\n\u003cp\u003eGenuine Sandpiper flap valves are manufacturer-listed wet-end replacement components for compatible Sandpiper flap-valve AODD pumps. Matching the exact model, pump construction, flap valve material and manufacturer part number helps maintenance engineers and purchasing teams identify the correct replacement component.\u003c\/p\u003e\n\u003cdiv class=\"sp-benefit-grid\"\u003e\n\u003cdiv class=\"sp-benefit-card\"\u003e\n\u003cdiv class=\"sp-benefit-number\"\u003e01\u003c\/div\u003e\n\u003ch4\u003eModel-Specific Compatibility\u003c\/h4\u003e\n\u003cp\u003eSelect according to the verified Sandpiper pump model and construction rather than nominal size alone.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sp-benefit-card\"\u003e\n\u003cdiv class=\"sp-benefit-number\"\u003e02\u003c\/div\u003e\n\u003ch4\u003eMaterial Selection\u003c\/h4\u003e\n\u003cp\u003eUse only manufacturer-listed flap valve materials for the applicable pump configuration.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sp-benefit-card\"\u003e\n\u003cdiv class=\"sp-benefit-number\"\u003e03\u003c\/div\u003e\n\u003ch4\u003eExact Part Identification\u003c\/h4\u003e\n\u003cp\u003eUse the Sandpiper manufacturer part number to support accurate maintenance and procurement.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sp-benefit-card\"\u003e\n\u003cdiv class=\"sp-benefit-number\"\u003e04\u003c\/div\u003e\n\u003ch4\u003eGenuine Sandpiper Replacement Part\u003c\/h4\u003e\n\u003cp\u003eMaintain compatible Sandpiper pumps using genuine manufacturer replacement components.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003ch3\u003eWhen Should SPB20 Flap Valves Be Inspected?\u003c\/h3\u003e\n\u003cp\u003eInspect the flap-valve area during planned wet-end maintenance and whenever check-valve operation requires investigation.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eThe flap valve shows visible wear, cuts, deformation or damage\u003c\/li\u003e\n\u003cli\u003eForeign material prevents the flap from closing correctly against the seat\u003c\/li\u003e\n\u003cli\u003eThe mating flap valve seat shows wear or damage\u003c\/li\u003e\n\u003cli\u003ePump priming, solids handling or check-valve sealing requires investigation\u003c\/li\u003e\n\u003cli\u003eThe pump is undergoing scheduled wet-end maintenance\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cdiv class=\"sp-faq\"\u003e\n\u003cdetails\u003e\u003csummary\u003eWhat is the Sandpiper SPB20 flap valve?\u003c\/summary\u003e\u003cp\u003eIt is the moving wet-end check-valve component used in compatible Sandpiper SPB20 flap-valve AODD pumps. It opens away from and closes against the flap valve seat as the pump cycles.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eIs the flap valve the same as the complete flap-valve system?\u003c\/summary\u003e\u003cp\u003eNo. The flap valve is the moving replacement component. The flap valve seat and related hinge, wear, retainer or sealing components are separate parts where Sandpiper lists them separately.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eWhich flap valve materials are listed for this SPB20?\u003c\/summary\u003e\u003cp\u003eThe manufacturer-listed selections shown on this page are 316 Stainless Steel. Confirm the exact manufacturer part number and chemical compatibility before ordering.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eAre flap valve seats included with these flap valves?\u003c\/summary\u003e\u003cp\u003eDo not assume a flap valve seat is included with an individual flap valve part number. Sandpiper lists seats separately on applicable service-parts lists unless a specific kit or assembly states otherwise.\u003c\/p\u003e\u003c\/details\u003e\u003cdetails\u003e\u003csummary\u003eHow do I confirm the correct SPB20 flap valve?\u003c\/summary\u003e\u003cp\u003eCheck the complete pump model and construction, identify the required flap valve material and verify the corresponding Sandpiper manufacturer part number against the current service manual.\u003c\/p\u003e\u003c\/details\u003e\n\u003c\/div\u003e\n\u003ch3 style=\"text-align:center;\"\u003eExplore Other Sandpiper Wet-End Parts\u003c\/h3\u003e\n\u003cdiv class=\"sp-related-grid\"\u003e\n\u003cdiv class=\"sp-related-card\"\u003e\n\u003cspan class=\"sp-related-label\"\u003eFlap Valves\u003c\/span\u003e\u003ch4\u003eAll Sandpiper AODD Pump Flap Valves\u003c\/h4\u003e\n\u003cp\u003eBrowse genuine Sandpiper flap valves by pump model, construction, material and manufacturer part number.\u003c\/p\u003e\n\u003ca href=\"\/collections\/sandpiper-aodd-pump-flap-valves\"\u003eView Collection →\u003c\/a\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sp-related-card\"\u003e\n\u003cspan class=\"sp-related-label\"\u003eBall Valve Parts\u003c\/span\u003e\u003ch4\u003eSandpiper AODD Pump Check Balls\u003c\/h4\u003e\n\u003cp\u003eLooking for a ball-type check-valve pump? Browse genuine Sandpiper AODD pump check balls.\u003c\/p\u003e\n\u003ca href=\"\/collections\/sandpiper-aodd-pump-check-balls\"\u003eView Collection →\u003c\/a\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sp-help-banner\"\u003e\n\u003cdiv\u003e\n\u003ch3\u003eNeed Help Selecting the Correct SPB20 Flap Valve?\u003c\/h3\u003e\n\u003cp\u003eSend ABS Engineering your complete Sandpiper SPB20 pump model, nameplate details, pump construction and existing flap valve part number for verification before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"sp-cta-links\"\u003e\n\u003ca href=\"\/pages\/contact\"\u003eRequest a Quote\u003c\/a\u003e\u003ca href=\"\/pages\/contact\"\u003eRequest Part Verification\u003c\/a\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"SANDPIPER","offers":[{"title":"316 Stainless Steel","offer_id":53332698071221,"sku":"338.016.110","price":0.0,"currency_code":"MYR","in_stock":false}]}],"url":"https:\/\/store.abset.com\/collections\/sandpiper-heavy-duty-aodd-pump-flap-valves.oembed","provider":"ABS Engineering \u0026 Trading Sdn Bhd","version":"1.0","type":"link"}