Quicksilver 99370A 2 Water Shutter Assembly for MerCruiser Sterndrive Exhaust

The Quicksilver 99370A 2 Water Shutter Assembly is an OEM-quality exhaust water shutter (also known as an exhaust flapper or check valve) designed for MerCruiser sterndrive engines. This critical component mounts in the exhaust system and functions as a flexible check valve, preventing following seas and backflow water from entering the exhaust manifold and reaching the engine when the engine is not running or operating at low RPM.

Key Features:

• Acts as a check valve to block water intrusion through the exhaust system
• Designed for use with MerCruiser sterndrive V6 and V8 engines fitted with 15-degree and 3-inch exhaust elbows
• 2.48" diameter at cross pin (round pin) for proper fitment in compatible Y-pipe bellows with round grommet holes
• Supersedes OEM part number 92802 / 23-92852
• Genuine Quicksilver OEM replacement part backed by Mercury Marine quality standards

Cross-Reference Part Numbers:

• Mercury / Quicksilver: 99370A2, 99370A 2, 92852, 23-92852
• Sierra Marine: 18-2733
• Mallory Marine: 9-42801
• GLM Marine: 89160
• Recmar Marine: REC99370A2

This water shutter assembly is a straightforward but essential maintenance item for MerCruiser sterndrive owners. Replacing a worn or damaged shutter helps protect the engine from costly water ingestion damage. Always verify compatibility using your engine's model, serial number, and year before ordering.