Water Shutter Kit With Crommet for MerCruiser Stern Drive V6 V8 Engine 4.3L 5.0L 5.7L 5.8L 6.3L 7.4L 8.2L Y Pipe Exhaust Flapper used 2 Piece Maniflod Elbow 807166A-1 - MARKGOO 807166A1

• Water Shutter Kit 807166A1 fits MerCruiser Sterndrive engines from year 1998 & UP. Fits oval 4 inch Y-pipes with two rectangular pin holes. Also called a water flapper. Acts as a flexible check valve to stop water from returning up the exhaust system to the engine. Fit for MerCruiser Stern Drive 4.3L 5.0L 5.7L 5.8L 6.3L 7.4L 8.2L Diesel or Gas Engines. The Part number is Replaced by 807166A1, 807166A-1 OBR Red Rhino MR-507, GLM Marine 89175, Pro Marine 65167. If you have two rectangular holes for the grommets you need the water shutters 807166A1. If your Y-pipe changes size a few inches bellow the shutter you have a one piece manifold V6 Y-pipe and need shutter 807166A2. Easy to install with common shop tools. See your owner's manual or service manual for specific applications and replacement instructions.