{"product_id":"42724a3-water-tube-housing-kit-for-mercruiser-alpha-gen-1","title":"42724A3 Water Tube Housing Kit for MerCruiser Alpha Gen 1 | JLM Marine","description":"\u003ch2\u003eWater Tube Housing Kit for MerCruiser Alpha Gen 1 – OEM 42724A3\u003c\/h2\u003e\n\n\u003cp\u003eThis water tube housing kit is engineered for MerCruiser #1, R, MR, and Alpha One Generation 1 sterndrive applications. It provides a complete water pocket cover and tube assembly to maintain proper cooling system function in your outdrive.\u003c\/p\u003e\n\n\u003cp\u003eThis kit directly replaces MerCruiser part number \u003cstrong\u003e42724A3\u003c\/strong\u003e and GLM part number \u003cstrong\u003e12200\u003c\/strong\u003e, offering a comprehensive solution for water tube and pocket cover service.\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003eComplete assembly includes water tube, pocket cover, gasket, bushing, and mounting bolts\u003c\/li\u003e\n\u003cli\u003eDesigned for Alpha One Generation 1 drives (not compatible with Alpha One Generation II)\u003c\/li\u003e\n\u003cli\u003eFits MerCruiser #1, R, MR, and Alpha One sterndrives\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePart Number Cross-Reference\u003c\/h2\u003e\n\n\u003cp\u003eUse this table to confirm equivalent part numbers across OEM and aftermarket brands.\u003c\/p\u003e\n\n\u003ctable border=\"1\" cellpadding=\"8\" cellspacing=\"0\"\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\u003eMerCruiser\u003c\/td\u003e\n\u003ctd\u003e42724A3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGLM\u003c\/td\u003e\n\u003ctd\u003e12200\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAftermarket\u003c\/td\u003e\n\u003ctd\u003e32-54236\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eCompatible Engine Models\u003c\/h2\u003e\n\n\u003cp\u003eConfirm your engine model\/year in the table below. For Mercury owners, here's a guide to help you identify your engine's serial\/model: \u003ca href=\"https:\/\/jlmmarine.com\/blogs\/serial-number-guide\/mercury-outboard-serial-number-guide\" rel=\"nofollow noopener\" target=\"_blank\"\u003eMercury Serial Number Guide\u003c\/a\u003e. You can also review exploded diagrams to verify part numbers: \u003ca href=\"https:\/\/jlmmarine.com\/blogs\/diagrams\/mercury-parts-catalog\" rel=\"nofollow noopener\" target=\"_blank\"\u003eMercury Parts Diagrams \u0026amp; Catalog\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ctable border=\"1\" cellpadding=\"8\" cellspacing=\"0\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eDrive Model\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\u003eMerCruiser #1\u003c\/td\u003e\n\u003ctd\u003eCompatible\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMerCruiser R\u003c\/td\u003e\n\u003ctd\u003eCompatible\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMerCruiser MR\u003c\/td\u003e\n\u003ctd\u003eCompatible\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAlpha One Generation 1\u003c\/td\u003e\n\u003ctd\u003eCompatible\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAlpha One Generation II\u003c\/td\u003e\n\u003ctd\u003e\u003cstrong\u003eNOT Compatible\u003c\/strong\u003e\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\n\u003ctable border=\"1\" cellpadding=\"8\" cellspacing=\"0\"\u003e\n\u003cthead\u003e\n\u003ctr\u003e\n\u003cth\u003eSpecification\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eOEM Part Number\u003c\/td\u003e\n\u003ctd\u003e42724A3\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eGLM Part Number\u003c\/td\u003e\n\u003ctd\u003e12200\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eApplication\u003c\/td\u003e\n\u003ctd\u003eMerCruiser #1, R, MR, Alpha One Gen 1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eKit Type\u003c\/td\u003e\n\u003ctd\u003eWater Pocket Cover \u0026amp; Tube Assembly\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch2\u003ePackage Contents\u003c\/h2\u003e\n\n\u003cp\u003eThis complete water tube housing kit includes:\u003c\/p\u003e\n\n\u003cul\u003e\n\u003cli\u003e\u003cspan style=\"color:red;\"\u003e\u003cstrong\u003eWater tube\u003c\/strong\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cspan style=\"color:red;\"\u003e\u003cstrong\u003eWater pocket cover\u003c\/strong\u003e\u003c\/span\u003e\u003c\/li\u003e\n\u003cli\u003eCover gasket\u003c\/li\u003e\n\u003cli\u003eBushing\u003c\/li\u003e\n\u003cli\u003eMounting bolts\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Guide\u003c\/h2\u003e\n\n\u003col\u003e\n\u003cli\u003eDisconnect the battery and drain the outdrive cooling system to prevent water spillage during service.\u003c\/li\u003e\n\u003cli\u003eRemove the lower unit from the upper gearcase following your MerCruiser service manual procedures.\u003c\/li\u003e\n\u003cli\u003eLocate and remove the old water pocket cover by unscrewing the mounting bolts. Carefully extract the old water tube and bushing.\u003c\/li\u003e\n\u003cli\u003eClean all mating surfaces on the gearcase thoroughly, removing old gasket material and corrosion to ensure a proper seal.\u003c\/li\u003e\n\u003cli\u003eInstall the new bushing into the gearcase housing, ensuring it is properly seated.\u003c\/li\u003e\n\u003cli\u003eInsert the new water tube through the bushing, aligning it with the housing channel.\u003c\/li\u003e\n\u003cli\u003ePosition the new gasket on the water pocket cover mounting surface.\u003c\/li\u003e\n\u003cli\u003eInstall the water pocket cover over the water tube, aligning the bolt holes with the gearcase.\u003c\/li\u003e\n\u003cli\u003eThread in the new mounting bolts and tighten in a cross-pattern to the torque specification listed in your service manual.\u003c\/li\u003e\n\u003cli\u003eReinstall the lower unit onto the upper gearcase, ensuring the water tube seats properly into the lower unit inlet.\u003c\/li\u003e\n\u003cli\u003eRefill the outdrive with the appropriate gear lubricant and reconnect the battery.\u003c\/li\u003e\n\u003cli\u003eTest the cooling system by running the engine with a flush attachment or in the water, checking for leaks around the water pocket cover.\u003c\/li\u003e\n\u003c\/ol\u003e\n\n\u003ch2\u003eTroubleshooting \u0026amp; FAQ\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: How do I confirm this kit fits my specific Alpha One drive?\u003c\/strong\u003e\u003cbr\u003e\nA: This kit is designed exclusively for Alpha One \u003cstrong\u003eGeneration 1\u003c\/strong\u003e drives, including MerCruiser #1, R, and MR models. It will NOT fit Alpha One Generation II drives. Check your drive's serial number tag or consult your owner's manual to verify you have a Gen 1 unit before ordering.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What are the signs that my water tube housing needs replacement?\u003c\/strong\u003e\u003cbr\u003e\nA: Common symptoms include overheating, reduced water flow from the tell-tale outlet, visible corrosion or cracks in the water pocket cover, or coolant leaks around the gearcase area. If your engine runs hot despite proper impeller function, inspect this assembly.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Can I reuse the old bolts and gasket?\u003c\/strong\u003e\u003cbr\u003e\nA: No, it is strongly recommended to use the new gasket and bolts included in this kit. Reusing old gaskets can lead to leaks, and old bolts may have corrosion or stretched threads that compromise the seal and structural integrity.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: How often should this water tube housing be replaced?\u003c\/strong\u003e\u003cbr\u003e\nA: Replace the water tube housing whenever you notice leaks, corrosion, or damage during routine maintenance. Inspect it annually during impeller changes or lower unit service, and replace as needed—typically every 3–5 years depending on operating conditions and exposure to saltwater.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: Is this an OEM part or aftermarket?\u003c\/strong\u003e\u003cbr\u003e\nA: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: How fast do you ship and how much does it cost?\u003c\/strong\u003e\u003cbr\u003e\nA: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eQ: What is your warranty and return policy?\u003c\/strong\u003e\u003cbr\u003e\nA: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused \u0026amp; in original condition); please see our policy page or reach out for instructions.\u003c\/p\u003e\n\n\u003ch2\u003eImportant Notes\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003eVerify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.\u003c\/li\u003e\n\u003cli\u003eThis product is an aftermarket replacement part and is not an OEM component.\u003c\/li\u003e\n\u003cli\u003eProfessional installation is recommended to ensure safety and optimal performance.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhy Choose JLM MARINE?\u003c\/h2\u003e\n\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuality Assured:\u003c\/strong\u003e As a trusted manufacturer for over 20 years, we supply top marine brands globally.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFast Global Shipping:\u003c\/strong\u003e Free delivery worldwide in 5–15 days.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDirect from Manufacturer:\u003c\/strong\u003e Competitive pricing without compromising quality.\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"JLM Marine","offers":[{"title":"Default Title","offer_id":50489733972281,"sku":"22KM017","price":25.5,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0885\/0433\/6697\/files\/Water_Pump_Impeller_Kit_for_Mercury_R-MR-Alpha_One_42724A3_-_JLM_MARINE-8290012.jpg?v=1754991208","url":"https:\/\/jlmmarine.com\/products\/42724a3-water-tube-housing-kit-for-mercruiser-alpha-gen-1","provider":"JLM Marine Boat Parts Limited","version":"1.0","type":"link"}