{"product_id":"mercury-water-pump-base-fits-9-9-hp-fourstroke-bigfoot-outboard-15-hp-fourstroke-outboard-20-hp-fourstroke-outboard-46-803750a04","title":"Mercury – Quicksilver Water Pump Base Assembly | Reinforced Nylon with Seal | 803750A04","description":"\u003cp data-start=\"0\" data-end=\"93\"\u003e\u003cstrong data-start=\"0\" data-end=\"91\"\u003eMercury – Quicksilver Water Pump Base Assembly | Reinforced Nylon with Seal | 803750A04\u003c\/strong\u003e\u003c\/p\u003e\n\u003chr data-start=\"95\" data-end=\"98\"\u003e\n\u003ch3 data-start=\"100\" data-end=\"118\"\u003e\u003cstrong data-start=\"104\" data-end=\"116\"\u003eOverview\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"119\" data-end=\"778\"\u003eA dependable cooling system keeps your engine alive, and that starts at the base. The \u003cstrong data-start=\"205\" data-end=\"270\"\u003eMercury Marine 803750A04 Quicksilver Water Pump Base Assembly\u003c\/strong\u003e is built tough to keep water flowing smoothly through your outboard. Made from \u003cstrong data-start=\"350\" data-end=\"370\"\u003ereinforced nylon\u003c\/strong\u003e and featuring an \u003cstrong data-start=\"388\" data-end=\"418\"\u003eintegrated seal and O-ring\u003c\/strong\u003e, it’s designed to handle years of use in heat, pressure, and saltwater without warping or leaking. It’s a direct replacement for \u003cstrong data-start=\"548\" data-end=\"584\"\u003eMercury 9.9HP FourStroke BigFoot\u003c\/strong\u003e, \u003cstrong data-start=\"586\" data-end=\"626\"\u003e15HP FourStroke (0R235949 and newer)\u003c\/strong\u003e, and \u003cstrong data-start=\"632\" data-end=\"672\"\u003e20HP FourStroke (0R235168 and newer)\u003c\/strong\u003e models — the same part Mercury installs at the factory to keep their engines running cool and reliable.\u003c\/p\u003e\n\u003chr data-start=\"780\" data-end=\"783\"\u003e\n\u003ch3 data-start=\"785\" data-end=\"807\"\u003e\u003cstrong data-start=\"789\" data-end=\"805\"\u003eKey Features\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli data-start=\"810\" data-end=\"898\"\u003e\n\u003cstrong data-start=\"810\" data-end=\"822\"\u003ePurpose:\u003c\/strong\u003e Provides a solid, watertight foundation for your engine’s cooling system.\u003c\/li\u003e\n\u003cli data-start=\"901\" data-end=\"1010\"\u003e\n\u003cstrong data-start=\"901\" data-end=\"918\"\u003eConstruction:\u003c\/strong\u003e Built from \u003cstrong data-start=\"930\" data-end=\"950\"\u003ereinforced nylon\u003c\/strong\u003e that stands up to vibration, heat, and marine conditions.\u003c\/li\u003e\n\u003cli data-start=\"1013\" data-end=\"1110\"\u003e\n\u003cstrong data-start=\"1013\" data-end=\"1024\"\u003eDesign:\u003c\/strong\u003e Comes with an \u003cstrong data-start=\"1039\" data-end=\"1069\"\u003eintegrated seal and O-ring\u003c\/strong\u003e for a clean fit and easy installation.\u003c\/li\u003e\n\u003cli data-start=\"1113\" data-end=\"1191\"\u003e\n\u003cstrong data-start=\"1113\" data-end=\"1129\"\u003ePerformance:\u003c\/strong\u003e Maintains consistent water pressure to prevent overheating.\u003c\/li\u003e\n\u003cli data-start=\"1194\" data-end=\"1264\"\u003e\n\u003cstrong data-start=\"1194\" data-end=\"1210\"\u003eEase of Use:\u003c\/strong\u003e Direct OEM replacement that bolts right into place.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"1266\" data-end=\"1269\"\u003e\n\u003ch3 data-start=\"1271\" data-end=\"1308\"\u003e\u003cstrong data-start=\"1275\" data-end=\"1306\"\u003eEngine \u0026amp; Boat Compatibility\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli data-start=\"1311\" data-end=\"1349\"\u003e\u003cstrong data-start=\"1311\" data-end=\"1347\"\u003eMercury 9.9HP FourStroke BigFoot\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli data-start=\"1352\" data-end=\"1413\"\u003e\n\u003cstrong data-start=\"1352\" data-end=\"1379\"\u003eMercury 15HP FourStroke\u003c\/strong\u003e (serial number 0R235949 and up)\u003c\/li\u003e\n\u003cli data-start=\"1416\" data-end=\"1477\"\u003e\n\u003cstrong data-start=\"1416\" data-end=\"1443\"\u003eMercury 20HP FourStroke\u003c\/strong\u003e (serial number 0R235168 and up)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"1479\" data-end=\"1482\"\u003e\n\u003ch3 data-start=\"1484\" data-end=\"1527\"\u003e\u003cstrong data-start=\"1488\" data-end=\"1525\"\u003ePerformance \u0026amp; Real-World Benefits\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"1528\" data-end=\"1847\"\u003eThe \u003cstrong data-start=\"1532\" data-end=\"1561\"\u003e803750A04 water pump base\u003c\/strong\u003e helps your outboard keep its cool under pressure. When bases age, they can warp or crack, letting air or water escape — the kind of hidden problem that leads to overheating. Swapping it out restores your cooling system’s integrity, ensuring smooth, consistent flow through the motor.\u003c\/p\u003e\n\u003cp data-start=\"1849\" data-end=\"2137\"\u003eIt’s built from reinforced nylon, a tough, lightweight material that handles marine punishment without deforming. With the seal and O-ring already integrated, there’s no fussing with extra parts or leaks. Once installed, it just works — keeping your outboard cool, quiet, and efficient.\u003c\/p\u003e\n\u003chr data-start=\"2139\" data-end=\"2142\"\u003e\n\u003ch3 data-start=\"2144\" data-end=\"2176\"\u003e\u003cstrong data-start=\"2148\" data-end=\"2174\"\u003eWhy Choose Mercury OEM\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"2177\" data-end=\"2455\"\u003eThe \u003cstrong data-start=\"2181\" data-end=\"2206\"\u003eQuicksilver 803750A04\u003c\/strong\u003e isn’t just made to fit — it’s made to \u003cem data-start=\"2245\" data-end=\"2251\"\u003elast\u003c\/em\u003e. Aftermarket bases often use cheaper plastics that can flex or distort over time. Mercury’s OEM version uses high-grade materials tested to withstand saltwater, temperature changes, and long run hours.\u003c\/p\u003e\n\u003cp data-start=\"2457\" data-end=\"2716\"\u003eThis is the same base Mercury technicians rely on at the factory and in the field. It’s built to meet their exact standards for sealing, performance, and long-term reliability. When it comes to cooling, you don’t want “close enough.” You want the real deal.\u003c\/p\u003e\n\u003chr data-start=\"2718\" data-end=\"2721\"\u003e\n\u003ch3 data-start=\"2723\" data-end=\"2736\"\u003e\u003cstrong data-start=\"2727\" data-end=\"2734\"\u003eFAQ\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"2738\" data-end=\"2882\"\u003e\u003cstrong data-start=\"2738\" data-end=\"2779\"\u003eQ1: What’s included in this assembly?\u003c\/strong\u003e\u003cbr data-start=\"2779\" data-end=\"2782\"\u003eIt includes the \u003cstrong data-start=\"2798\" data-end=\"2846\"\u003ewater pump base, integrated seal, and O-ring\u003c\/strong\u003e — everything you need to install.\u003c\/p\u003e\n\u003cp data-start=\"2884\" data-end=\"3049\"\u003e\u003cstrong data-start=\"2884\" data-end=\"2933\"\u003eQ2: Why should I replace the water pump base?\u003c\/strong\u003e\u003cbr data-start=\"2933\" data-end=\"2936\"\u003eA warped or cracked base can reduce water pressure and cause overheating. Replacing it restores proper cooling.\u003c\/p\u003e\n\u003cp data-start=\"3051\" data-end=\"3189\"\u003e\u003cstrong data-start=\"3051\" data-end=\"3077\"\u003eQ3: What’s it made of?\u003c\/strong\u003e\u003cbr data-start=\"3077\" data-end=\"3080\"\u003eIt’s made from \u003cstrong data-start=\"3095\" data-end=\"3115\"\u003ereinforced nylon\u003c\/strong\u003e, which is lightweight, heat-resistant, and built for marine conditions.\u003c\/p\u003e\n\u003cp data-start=\"3191\" data-end=\"3306\"\u003e\u003cstrong data-start=\"3191\" data-end=\"3225\"\u003eQ4: Is installation difficult?\u003c\/strong\u003e\u003cbr data-start=\"3225\" data-end=\"3228\"\u003eNo — it’s a \u003cstrong data-start=\"3240\" data-end=\"3263\"\u003edirect-fit OEM part\u003c\/strong\u003e that goes in easily with standard tools.\u003c\/p\u003e\n\u003cp data-start=\"3308\" data-end=\"3480\"\u003e\u003cstrong data-start=\"3308\" data-end=\"3362\"\u003eQ5: Why use OEM instead of an aftermarket version?\u003c\/strong\u003e\u003cbr data-start=\"3362\" data-end=\"3365\"\u003eOEM parts fit right the first time and last longer, giving you \u003cstrong data-start=\"3428\" data-end=\"3459\"\u003efactory-quality reliability\u003c\/strong\u003e and peace of mind.\u003c\/p\u003e","brand":"Mercury","offers":[{"title":"Default Title","offer_id":46940114026787,"sku":"46-803750A04","price":35.46,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/7410\/9475\/files\/803750A04_Main.jpg?v=1760631178","url":"https:\/\/partsvu.com\/en-au\/products\/mercury-water-pump-base-fits-9-9-hp-fourstroke-bigfoot-outboard-15-hp-fourstroke-outboard-20-hp-fourstroke-outboard-46-803750a04","provider":"PartsVu","version":"1.0","type":"link"}