99370A2 Exhaust Manifold Water Shutter Flapper for MerCruiser Stern Drives V6 V8 Engines Replacement Mercury Quicksilver OEM 23-92852 Sierra Marine 18-2733 Onan Marine Engine / Generator Sea Raw Cooling Pump 663-02730 & Below

663-02730 & Below

37-826313A01

1 X O-Ring 18-7420

Yamaha Marine Outboard 663-W0078-01 663-W0078-A0

99370A2 Exhaust Manifold Water Shutter Flapper for MerCruiser Stern Drives V6 V8 Engines Replacement Mercury Quicksilver OEM 23-92852 Sierra Marine 18-2733 Onan Marine Engine / Generator Sea Raw Cooling Pump 663-02730 & BelowSoxa Marine Stern Drive Exhaust Manifold Water Shutter Flapper Kit SoxaMarine 99370A 2 Water Shutter acts as a flexible check valve to stop water from returning up the exhaust system to the engine. Compatible with various V6 V8 1982 1987 Year MerCruiser stern drive engines exhaust manifolds installations Replaces Mercury Mercruiser OEM 99370A2, 99370A 2 and Mercury Quicksilver 23 92852, 92852 Match to Aftermarket Sierra Marine 18 2733, Mallory Marine