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 this plunger 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 Length: 15-1/2" - 27-1/2" Molded Rubber and Aluminum