Whether outfitting your boat for the first time or replacing old flushers, the Redline Canyon Boat Motor Flusher Round Circular Cup Muff Plunger with Hose Fitting Flush Kit – Marine Inboard Engine Flushing is perfect for nautical journeys and mechanical maintenance. Effectively flush your inboard boat engine with fresh water to rid salt, sand, and silt and to prevent clogging and corrosion. You can flush your engine after every trip and enjoy the convenience of test-running your boat on dry land before navigating the waters. It installs quickly with a twist and a garden hose. Attach it to your garden hose, twist on to attach to your intake, and turn on your water supply. This package includes 1 flusher and 1 hose fitting for your convenience. Hose and water supply required, not included. Warning: This product can expose you to chemicals which is [are] known to the State of California to cause cancer and birth defects or other reproductive harm.