Whether outfitting your boat for the first time or replacing old flushers, the Redline Canyon Dual Water Feed Boat Motor Flusher Rectangular Cup Muffs with Hose Fittings Flush Kit – Marine Outboard Engine Flushing is perfect for nautical journeys and mechanical maintenance. Effectively flush your outboard 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 added convenience of test-running your boat on dry land before navigating the waters. Simply attach to your garden hose, slide this over your boat's lower unit water intake, and turn on your water supply. This package includes 1 dual feed flusher and 2 hose fittings 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.