{"product_id":"water-coupling-assembly-for-alpha-one-gen-ii-sterndrives-replaces-mercury-marine-816597-sierra-18-3151-water-tube-coupler","title":"Sierra 18-3151 Water Coupling Assembly, OEM 47-43026T11, for Alpha One Gen II Drives","description":"\u003cp\u003eThe Sierra 18-3151 Water Coupling Assembly connects the water pump housing to the drive unit, directing raw cooling water into the engine's cooling circuit. It is a direct-fit replacement coupling designed for Alpha One Gen II drives and multiple outboard applications, and it cross-references to OEM number 47-43026T11.\u003c\/p\u003e\u003cp\u003eThe coupling is finished in white with a machined exterior for a precise, consistent fit against the mating water pump housing. It ships as a single-piece assembly (one coupling per package) so installers can replace a worn or leaking coupling without sourcing a full water pump kit. Because raw water passes directly through this component, a cracked or degraded coupling is a common cause of overheating or reduced water flow, making the 18-3151 a straightforward preventive-maintenance or repair item during a water pump service.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-3151\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e White\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eItem Dimensions:\u003c\/strong\u003e 7.25 x 6 x 1.5 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConnector Type:\u003c\/strong\u003e Coupling\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExterior Finish:\u003c\/strong\u003e Machined\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Type:\u003c\/strong\u003e NPT\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Pieces:\u003c\/strong\u003e 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.06 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282112875\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e 47-43026T11\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatibility:\u003c\/strong\u003e Alpha One Gen II drives and multiple outboard applications\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eFits Alpha One Gen II drives and multiple outboard applications.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e47-43026T11\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-3151 Water Coupling Assembly fit?\u003c\/strong\u003e The 18-3151 is designed for Alpha One Gen II drives and multiple outboard applications where a water coupling connects the water pump housing to the drive unit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-3151 coupling equivalent to OEM part 47-43026T11?\u003c\/strong\u003e Yes, Sierra 18-3151 cross-references directly to OEM number 47-43026T11, so it is a direct equivalent for that coupling.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is this water coupling assembly?\u003c\/strong\u003e It is white with a machined exterior finish, part number 18-3151.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the 18-3151 coupling?\u003c\/strong\u003e The Sierra 18-3151 measures 7.25 x 6 x 1.5 inches as a complete assembly.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-3151 Water Coupling Assembly weigh?\u003c\/strong\u003e It weighs 0.06 pounds, making it a lightweight single-piece component.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many pieces come in the package?\u003c\/strong\u003e One coupling assembly ships per package; the 18-3151 is sold as a single unit, not a kit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy would I need to replace this water coupling?\u003c\/strong\u003e A cracked, worn, or leaking coupling like the 18-3151 can restrict raw water flow to the engine, so replacing it is a common step when diagnosing or preventing engine overheating.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-3151 include a thread type?\u003c\/strong\u003e Yes, the coupling uses NPT (National Pipe Thread) threading.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this a genuine Sierra part or an aftermarket copy?\u003c\/strong\u003e The 18-3151 Water Coupling Assembly is a genuine Sierra-branded part manufactured under Sierra's own part number and packaging.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use this coupling with a full water pump kit installation?\u003c\/strong\u003e Yes, the 18-3151 coupling can be installed alongside a water pump housing and impeller as part of a broader water pump service, or replaced on its own if only the coupling has failed.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-3151?\u003c\/strong\u003e The UPC for this water coupling assembly is 808282112875.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988141224155,"sku":"SIE-18-3151","price":12.88,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-3151_lg__15456.1558123666.500.750.jpg?v=1785189177","url":"https:\/\/www.goodvibesmarina.com\/products\/water-coupling-assembly-for-alpha-one-gen-ii-sterndrives-replaces-mercury-marine-816597-sierra-18-3151-water-tube-coupler","provider":"Good Vibes Marina","version":"1.0","type":"link"}