{"product_id":"water-pump-impeller-fits-honda-8-20-hp-replaces-19210-zw9-a31-19210-zw9-a32","title":"Water Pump Impeller – Fits Honda 8–20 HP (Replaces 19210-ZW9-A31\/19210-ZW9-A32)","description":"\u003csection\u003e\n\u003c!-- 🔧 Table Styles (include only once per page) --\u003e\n\u003cstyle\u003e\n  \/* Outer container allows horizontal scrolling (with iOS momentum) *\/\n  .ss-table-wrap { overflow-x:auto; -webkit-overflow-scrolling:touch; }\n\n  \/* Base table styles *\/\n  table.ss-table { width:100%; border-collapse:collapse; min-width:640px; }\n  table.ss-table th, table.ss-table td {\n    padding:10px 12px; border:1px solid #e5e7eb; text-align:left; vertical-align:top;\n  }\n\n  \/* Key: prevent wrapping, word breaks, and vertical text in headers *\/\n  table.ss-table th {\n    white-space:nowrap;       \/* Do not wrap *\/\n    word-break:normal;        \/* Don’t break words *\/\n    letter-spacing:normal;    \/* Prevent theme styles from stretching letters *\/\n    font-weight:600;\n    background:#f8fafc;\n  }\n\n  \/* Small screen optimization *\/\n  @media (max-width:480px){\n    table.ss-table th, table.ss-table td { padding:8px 10px; font-size:14px; }\n  }\n\u003c\/style\u003e\n\n\u003ch2\u003eProduct Details\u003c\/h2\u003e\n\u003cp\u003eThis aftermarket \u003cstrong\u003eWater Pump Impeller – Fits Honda 8–20 HP\u003c\/strong\u003e is engineered for 4-stroke outboard engines from 2000 to 2013, including BF8, BF9.9, BF15, and BF20 models. It provides a reliable seal and efficient water circulation to prevent engine overheating. Please review the compatibility table for specific shaft length requirements, as fitment varies by model.\u003c\/p\u003e\n\u003cp\u003eIt serves as a direct replacement for Honda part numbers 19210-ZW9-A31 and 19210-ZW9-A32, along with Sierra 18-32455, GLM 91015, and CEF 500348.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eInstalls with an internal drive key mount.\u003c\/li\u003e\n  \u003cli\u003eConstructed from durable synthetic rubber for longevity.\u003c\/li\u003e\n  \u003cli\u003eEngineered to meet OEM specifications for fit and performance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePart Number Matrix\u003c\/h2\u003e\n\u003cp\u003eUse this matrix to confirm equivalent references across OEM and aftermarket suppliers.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Part Number Matrix\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth\u003eBrand\u003c\/th\u003e\n        \u003cth\u003ePart Number\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eHonda\u003c\/td\u003e\n        \u003ctd\u003e19210-ZW9-A31\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eHonda\u003c\/td\u003e\n        \u003ctd\u003e19210-ZW9-A32\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eSierra\u003c\/td\u003e\n        \u003ctd\u003e18-32455\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eGLM\u003c\/td\u003e\n        \u003ctd\u003e91015\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eCEF\u003c\/td\u003e\n        \u003ctd\u003e500348\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eEngine \u0026amp; Model Compatibility\u003c\/h2\u003e\n\u003cp\u003eConfirm your engine model\/year in the table below.\u003c\/p\u003e\n\u003cp\u003eFor Honda BF8 and BF9.9 models, this impeller is only compatible with extra-long shaft (25\") configurations. For BF15 and BF20 models, it fits all shaft lengths.\u003c\/p\u003e\n\u003cdiv class=\"ss-table-wrap\"\u003e\n  \u003ctable class=\"ss-table\" aria-label=\"Engine \u0026amp; Model Compatibility\"\u003e\n    \u003cthead\u003e\n      \u003ctr\u003e\n        \u003cth\u003eBrand\u003c\/th\u003e\n        \u003cth\u003eModel\u003c\/th\u003e\n        \u003cth\u003eRated HP\u003c\/th\u003e\n        \u003cth\u003eStroke\u003c\/th\u003e\n        \u003cth\u003eYears\u003c\/th\u003e\n        \u003cth\u003eOEM Part No.\u003c\/th\u003e\n        \u003cth\u003eNotes\u003c\/th\u003e\n      \u003c\/tr\u003e\n    \u003c\/thead\u003e\n    \u003ctbody\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eHonda\u003c\/td\u003e\n        \u003ctd\u003eBF8D\u003c\/td\u003e\n        \u003ctd\u003e8\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e2002–2013\u003c\/td\u003e\n        \u003ctd\u003e19210-ZW9-A32\u003c\/td\u003e\n        \u003ctd\u003eExtra-long shaft (25\") only\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eHonda\u003c\/td\u003e\n        \u003ctd\u003eBFP8D\u003c\/td\u003e\n        \u003ctd\u003e8\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e2001–2007\u003c\/td\u003e\n        \u003ctd\u003e19210-ZW9-A31\u003c\/td\u003e\n        \u003ctd\u003eExtra-long shaft (25\") models\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eHonda\u003c\/td\u003e\n        \u003ctd\u003eBF9.9D\u003c\/td\u003e\n        \u003ctd\u003e9.9\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e2002–2013\u003c\/td\u003e\n        \u003ctd\u003e19210-ZW9-A32\u003c\/td\u003e\n        \u003ctd\u003eExtra-long shaft (25\") only\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eHonda\u003c\/td\u003e\n        \u003ctd\u003eBFP9.9D\u003c\/td\u003e\n        \u003ctd\u003e9.9\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e2001–2007\u003c\/td\u003e\n        \u003ctd\u003e19210-ZW9-A31\u003c\/td\u003e\n        \u003ctd\u003eExtra-long shaft (25\") models\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eHonda\u003c\/td\u003e\n        \u003ctd\u003eBF15D\u003c\/td\u003e\n        \u003ctd\u003e15\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e2003–2006\u003c\/td\u003e\n        \u003ctd\u003e19210-ZW9-A32\u003c\/td\u003e\n        \u003ctd\u003eAll shaft lengths\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eHonda\u003c\/td\u003e\n        \u003ctd\u003eBFP15D\u003c\/td\u003e\n        \u003ctd\u003e15\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e2003–2006\u003c\/td\u003e\n        \u003ctd\u003e19210-ZW9-A32\u003c\/td\u003e\n        \u003ctd\u003eAll shaft lengths\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eHonda\u003c\/td\u003e\n        \u003ctd\u003eBF20D\u003c\/td\u003e\n        \u003ctd\u003e20\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e2003–2006\u003c\/td\u003e\n        \u003ctd\u003e19210-ZW9-A32\u003c\/td\u003e\n        \u003ctd\u003eAll shaft lengths\u003c\/td\u003e\n      \u003c\/tr\u003e\n      \u003ctr\u003e\n        \u003ctd\u003eHonda\u003c\/td\u003e\n        \u003ctd\u003eBFP20D\u003c\/td\u003e\n        \u003ctd\u003e20\u003c\/td\u003e\n        \u003ctd\u003e4-Stroke\u003c\/td\u003e\n        \u003ctd\u003e2003–2006\u003c\/td\u003e\n        \u003ctd\u003e19210-ZW9-A32\u003c\/td\u003e\n        \u003ctd\u003eAll shaft lengths\u003c\/td\u003e\n      \u003c\/tr\u003e\n    \u003c\/tbody\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch2\u003eTechnical Specs\u003c\/h2\u003e\n\u003cdl\u003e\n  \u003cdt\u003eProduct Type\u003c\/dt\u003e\n\u003cdd\u003eWater Pump Impeller\u003c\/dd\u003e\n  \u003cdt\u003eInstallation\u003c\/dt\u003e\n\u003cdd\u003eDirect replacement\u003c\/dd\u003e\n  \u003cdt\u003eConnection\u003c\/dt\u003e\n\u003cdd\u003eInternal key mount\u003c\/dd\u003e\n  \u003cdt\u003eHousing Material\u003c\/dt\u003e\n\u003cdd\u003eSynthetic rubber\u003c\/dd\u003e\n  \u003cdt\u003eHousing Color\u003c\/dt\u003e\n\u003cdd\u003eBlack\u003c\/dd\u003e\n  \u003cdt\u003eDimensions\u003c\/dt\u003e\n\u003cdd\u003eWidth: 45.6 mm, Shaft: 16.2 mm, Thickness: 14.8 mm\u003c\/dd\u003e\n  \u003cdt\u003eFitting Type\u003c\/dt\u003e\n\u003cdd\u003eInternal drive key\u003c\/dd\u003e\n  \u003cdt\u003eOther Technical Attributes\u003c\/dt\u003e\n\u003cdd\u003eUses woodruff key for installation\u003c\/dd\u003e\n\u003c\/dl\u003e\n\n\u003ch2\u003eWhat’s in the Box\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cspan style=\"color:#d0021b;\"\u003e1\u003c\/span\u003e x Impeller, Pump (UL) (Replaces 19210-ZW9-A32)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003col\u003e\n  \u003cli\u003eDisconnect the battery and remove the engine cover.\u003c\/li\u003e\n  \u003cli\u003eDrain the lower unit gear oil.\u003c\/li\u003e\n  \u003cli\u003eRemove the lower unit by unbolting it from the upper engine casing.\u003c\/li\u003e\n  \u003cli\u003ePlace the lower unit on a workbench and remove the water pump housing bolts.\u003c\/li\u003e\n  \u003cli\u003eSlide the housing up to expose the old impeller. Note the rotational direction of the fins.\u003c\/li\u003e\n  \u003cli\u003eRemove the old impeller, taking care not to lose the woodruff key from the driveshaft.\u003c\/li\u003e\n  \u003cli\u003eClean the housing and wear plate, inspecting for scoring or corrosion.\u003c\/li\u003e\n  \u003cli\u003eInstall the new woodruff key and slide the new impeller onto the shaft.\u003c\/li\u003e\n  \u003cli\u003eLubricate the inside of the housing and reinstall it, ensuring the impeller fins are oriented correctly.\u003c\/li\u003e\n  \u003cli\u003eTorque the housing bolts to the manufacturer's specification.\u003c\/li\u003e\n  \u003cli\u003eReinstall the lower unit, refill the gear oil, and test the engine in the water.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\u003cdetails\u003e\u003csummary\u003eHow do I know if this impeller fits my specific Honda model?\u003c\/summary\u003e\u003cp\u003eThis impeller fits Honda BF8, BF9.9, BF15, and BF20 engines from specific year ranges. Crucially, for BF8 and BF9.9 models, it only fits extra-long shaft (25\") versions. For BF15 and BF20 models, it fits all shaft lengths. Always check your engine model, year, and shaft length against the compatibility table.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWhat is the difference between 19210-ZW9-A31 and 19210-ZW9-A32?\u003c\/summary\u003e\u003cp\u003ePart number 19210-ZW9-A32 is the official supersession for 19210-ZW9-A31. This means it is the newer, recommended replacement part by the manufacturer. Both numbers refer to the same part in terms of fit and function for the applications listed.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWhat are the signs of a failing water pump impeller?\u003c\/summary\u003e\u003cp\u003eCommon signs include a weak or intermittent water stream from the tell-tale port, frequent engine overheating alarms, and a dry, cracked, or brittle appearance of the old impeller upon inspection. It is a critical maintenance item that should be inspected regularly.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eHow often should I replace my outboard's impeller?\u003c\/summary\u003e\u003cp\u003eAs a general rule, it's recommended to inspect the impeller annually and replace it every 1-2 years or every 100-200 hours of use, whichever comes first. This interval can be shorter if you operate frequently in sandy, silty, or saltwater conditions.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eIs the woodruff key included?\u003c\/summary\u003e\u003cp\u003eThis package contains only the impeller. The woodruff key, gaskets, and housing plate should be purchased separately if needed or as part of a complete water pump repair kit.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eDoes this fit any other brands besides Honda?\u003c\/summary\u003e\u003cp\u003eNo, this impeller is specifically designed and dimensioned for the Honda outboard models listed in the compatibility chart. Using it on other brands or models will likely result in poor performance or engine damage.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eOEM vs. Aftermarket?\u003c\/summary\u003e\u003cp\u003eThis listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eShipping speed \u0026amp; cost\u003c\/summary\u003e\u003cp\u003eWe ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.\u003c\/p\u003e\u003c\/details\u003e\n\u003cdetails\u003e\u003csummary\u003eWarranty \u0026amp; returns\u003c\/summary\u003e\u003cp\u003eCovered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused \u0026amp; in original condition). See our policy page or reach out for instructions.\u003c\/p\u003e\u003c\/details\u003e\n\n\u003ch2\u003eSafety \u0026amp; Important Info\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eVerify images\/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.\u003c\/li\u003e\n  \u003cli\u003eThis is an aftermarket replacement, not an OEM component.\u003c\/li\u003e\n  \u003cli\u003eProfessional installation is recommended for safety and performance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eAbout Sea Sierra\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePro-Grade Standards\u003c\/strong\u003e — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFast Global Fulfillment\u003c\/strong\u003e — Free standard delivery to most regions in 5–15 days.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eManufacturer-Direct Value\u003c\/strong\u003e — Fair pricing without compromising on materials or QC.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":50723977527611,"sku":"17IH006","price":13.9,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0826\/8673\/8747\/files\/17IH0061_52b65ba8-d734-4873-a5c6-dd93a1364c79.jpg?v=1763039083","url":"https:\/\/seasierra.com\/products\/water-pump-impeller-fits-honda-8-20-hp-replaces-19210-zw9-a31-19210-zw9-a32","provider":"SeaSierra","version":"1.0","type":"link"}