{"product_id":"sea-dog-521550-1-inboard-motor-flush-molded-rubber-cup-and-aluminum-leg-cooling-system-flusher-for-inboard-engines","title":"Sea-Dog Inboard Motor Flush 521550-1 - Molded Rubber and Aluminum Lower Unit Flusher","description":"\u003cp\u003eThe Sea-Dog Inboard Motor Flush (521550-1) is a molded rubber and aluminum flushing tool designed to clear salt, sand, minerals, and other contaminants out of an inboard engine's lower unit cooling system. Regular flushing with fresh water helps extend the service life of the engine by preventing buildup inside the cooling passages.\u003c\/p\u003e\u003cp\u003eThe design uses a rubber cup that fits directly over the water intake, sealing against the hull, while an extending aluminum leg holds the cup firmly in place. A standard garden hose connects to the flusher to supply fresh water directly to the intake, and no tools are required for setup or use. This makes it a practical, low-effort way to flush an inboard engine while it is out of the water.\u003c\/p\u003e\u003cp\u003eIt is well suited to routine maintenance tasks such as winterizing, spring commissioning, and general tune-ups where running the engine with a fresh water supply is needed. The molded rubber and aluminum construction is built to hold a seal against the hull while withstanding repeated hose connections.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sea-Dog\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 521550-1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Molded Rubber\/Aluminum\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimension A:\u003c\/strong\u003e 15-1\/2 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimension B:\u003c\/strong\u003e 27-1\/2 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e.99 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard Pack:\u003c\/strong\u003e 1 each\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting Type:\u003c\/strong\u003e Flush\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRecommended Use:\u003c\/strong\u003e For salt water\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 035514521451\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e5215501\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sea-Dog 521550-1 Inboard Motor Flush do?\u003c\/strong\u003e It flushes salt, sand, minerals, and other contaminants out of an inboard engine's lower unit cooling system using fresh water, which helps extend the engine's service life.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow do I use this motor flush?\u003c\/strong\u003e Fit the rubber cup of the 521550-1 over the water intake, connect a garden hose to it, and extend the aluminum leg to seal the cup against the hull; no tools are required.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDo I need any tools to install or use it?\u003c\/strong\u003e No tools are required. The Sea-Dog 521550-1 seats the rubber cup over the intake and the aluminum leg extends to hold the seal against the hull.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the 521550-1 made of?\u003c\/strong\u003e It is constructed of molded rubber and aluminum, combining a rubber sealing cup with an aluminum extending leg.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of this motor flush?\u003c\/strong\u003e The Sea-Dog Inboard Motor Flush measures 15-1\/2 inches (A) by 27-1\/2 inches (B).\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 521550-1 weigh?\u003c\/strong\u003e The Sea-Dog Inboard Motor Flush weighs.99 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this connected to a standard garden hose?\u003c\/strong\u003e Yes, the 521550-1 connects to a garden hose to supply fresh water through the cup and into the engine's cooling system.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen should I use an inboard motor flush like this?\u003c\/strong\u003e It is intended for winterizing, tune-ups, and other maintenance that requires running an inboard engine while it is out of the water.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sea-Dog 521550-1 suitable for saltwater use?\u003c\/strong\u003e Yes, the 521550-1 is recommended for use with engines operated in salt water, helping remove salt deposits from the cooling system.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes this product have an OEM equivalent part number?\u003c\/strong\u003e Yes, the Sea-Dog 521550-1 Inboard Motor Flush has an OEM equivalent part number of 5215501.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many units come in a pack?\u003c\/strong\u003e The Sea-Dog 521550-1 Inboard Motor Flush is sold in a standard pack of 1 each.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the mounting design work on any hull?\u003c\/strong\u003e The rubber cup seals against the hull around the water intake while the aluminum leg extends to hold it in place, a flush-mount design rather than a fixed hardware installation.\u003c\/p\u003e","brand":"Sea-Dog","offers":[{"title":"Default Title","offer_id":48988826239195,"sku":"S-D-521550-1","price":16.55,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/5293.jpg?v=1784429769","url":"https:\/\/www.goodvibesmarina.com\/products\/sea-dog-521550-1-inboard-motor-flush-molded-rubber-cup-and-aluminum-leg-cooling-system-flusher-for-inboard-engines","provider":"Good Vibes Marina","version":"1.0","type":"link"}