A built-in check valve prevents water from draining back into the bilge. Built with molded plastic, a synthetic rubber valve and a removable screen, this bilge strainer is easy to clean. The strainer allows for the maximum amount of water to be pumped from shallow bilge applications. It stops debris from entering the suction hose and includes a non-return valve to prevent drain back. Key Features Fits 1" and 1 1/2" hose Can be permanently mounted Easy to install and easy to clean