MARKGOO 99370A2 Water Shutter Assembly for MerCruiser Sterndrive R MR Alpha One V6 V8 4.3L 5.0L 5.7L Engine Outdrive Boat Motor Exhaust Flapper Sierra 18-2733 92802 99370A-2

99370A2 Water Shutter Assembly for Mercruiser Sterndrive R MR Alpha One V6 V8 4.3L 5.0L 5.7L Engine Outdrive Boat Motor Exhaust Flapper Sierra 18-2733 92802 99370A-2 Acts as a check valve to keep following seas/water from washing back through exhaust to engine when engine is not running or at low RPM. Shutter is 2.48" diameter at cross pin (round pin). SPECIFICATION: The shutters are designed for MerCruiser Sterndrive V6 V8 Engine with Y-pipe bellow elbow have two round holes for the grommets. If your Y-pipe has round holes with 4 inch diameter you need the water shutters 807166A3. APPLICATION: MerCruiser Sterndrive 4.3L 1985-1987 MerCruiser Sterndrive 5.0L 1985-1987 MerCruiser Sterndrive 5.7L 1985-1987 PACKAGE INCLUDED: 1X Water Shutter assembly 2X Grommets NOTE: See your owner's manual or service manual for specific applications and replacement instructions. It is VERY IMPORTANT to check outboard model, serial number, year and horsepower before purchase. Ask us any questions if you are not sure, we are pleasure to help you.