This Attwood Universal Motor Flusher quickly and easily flushes away materials such as salt, sand, silt, and alkali to prevent clogging and corrosion of an engine's cooling system. A self-adjusting clamping yoke fits on most domestic or imported inboard/outboards and outboards. Attach a garden hose and the molded cups deliver fresh water to flush the cooling system through the side intakes on the lower unit. This unit is round with a reinforced polypropylene body. Note: Avoid damaging the engine by not using full flow from the hose. Attwood Corporation has been an award-winning leader in engineering, testing, and manufacturing the highest quality marine products for over 100 years. We deliver safe and reliable lighting, fuel systems, water systems, seating & pedestals, swim ladders, custom upholstery, and general marine accessories that are easy to install and meet regulatory compliance.