Sierra 18-4456 Universal 3" Exhaust FlapperIncludes 3" stainless steel clamp.Features: Compounded rubber flapper valves stops water from entering the exhaust system; Constructed with weather resistant EPDM with U/V stabilizer; Replaces: Mercruiser Stern Drive; 34765A2, 34765A; Aqua-Power; 5018; GLM; 89240; Mallory; 9-44000; Redline; RL4456;