Mounts through the transom and provides a water exit for boats with self-bailing cockpits. Ideal for above the water line drainage. Valve features a soft black flapper. For use with 1-1/2" hose. Compatible with most self-bailing applications. Constructed of injection molded acetal. Installs with four #6 FH fasteners (not included). Size 6-3/16" L x 1-1/4" ID x 2-13/16" OD