Broad Compatibility: Specifically tailored for Yamaha all 4-stroke outboard engines. Compatible with Yamaha Offshore, VMax SHO, and XTO Offshore models, covering engines from 8HP-425HP (excluding 115HP) Quick Connect Design: Features a rapid-connect engine flush adapter that snaps onto your Yamaha outboard’s flushing port in seconds—no tools, no unscrewing, no lost O-rings. Streamlines flushing to save time and hassle Built-In Check Valve: The grey outboard flush adapter features a built-in check valve. This valve controls water flow, so boat owners don't need to constantly go back and forth to the faucet or struggle to manage the hose while preparing the flush port User-Friendly Operation: Designed exclusively for Yamaha outboard motors. Simply connect the adapter to the flushing port, attach a garden hose, and flush—no tools required. Cleans cooling systems, removing salt, sand, and debris to prevent corrosion and extend engine life Durable Build: Crafted from premium corrosion-resistant materials to withstand harsh marine environments. Engineered for long-lasting, reliable performance season after season The Outboard Engine Flush Kit is a must have for Yamaha boat owners. Its quickconnect adapter simplifies flushing, replacing the need to unscrew parts and risk losing O rings.​ Using it is straightforward. Connect the adapter to the engine's flushing port, attach a garden hose, and turn on the water. The kit thoroughly cleans internal components, especially the cooling system, removing salt and debris. Regular use guards against corrosion and extends engine life.​ The built in check valve in the grey adapter is a huge plus. It controls water flow, sparing owners the hassle of constant faucet trips or awkward hose handling.​ Made from high quality, corrosion resistant materials, this kit endures the tough marine environment for long lasting, reliable performance.​ Designed specifically for Yamaha 4 stroke outboard engines, it's compatible with Yamaha Offshore, VMax SHO, and XTO Offshore models from 8HP-425HP (excluding 115HP), covering a wide range of Yamaha engines.