Sierra 18-4456 Universal 3 Exhaust Flapper Includes 3 stainless steel clamp. Features Compounded rubber flapper valves stops water from entering the exhaust system Constructed with weather resistant EPDM with UV stabilizer Replaces Mercruiser Stern Drive 34765A2, 34765A Aqua-Power 5018 GLM 89240 Mallory 9-44000 Redline RL4456 California Residents WARNING Cancer and Reproductive Harm - P65Warnings.ca.gov Other Details Google Product Type Engine Parts Wiser Yes Product MPN 18-4456 Product UPC 3099