Keep your motor in tip top shape and running smoothly for years to come. Even if your not a mechanic, flushing your motor is necessary, and quite easy that an expert mechanic wont be necessary. Slipping these ear muffs on the lower unit of your engine, where the water is picked up, will keep all your gears running clear. WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov Quickly flush away salt, sand, minerals and contaminates from your lowerunit cooling system extending the engine&&';;s service life Easy to use molded PVC cups deliver fresh water to flush the cooling systemthrough side intakes on the lower unit Simple garden hose connection, no tools required Great for winterizing, tune-ups and other maintenance that requires running anoutboard engine out of the water Length: 9"