Mercury MerCruiser Exhaust Water Shutter Kit

The Mercury MerCruiser 807166A2 Exhaust Water Shutter Kit is a genuine OEM replacement component designed to protect your engine from water reversion through the exhaust system. Installed in the Y-pipe, the shutter acts as a one-way valve, allowing exhaust gases to exit while helping prevent following seas, backwash, or rough-water conditions from forcing water back into the engine.

This small but critical component helps reduce the risk of water ingestion, internal engine corrosion, and costly engine damage. Manufactured from heat-resistant and corrosion-resistant materials, it is designed specifically for MerCruiser sterndrive exhaust systems.

Features:

• Genuine Mercury Marine OEM part
• Prevents water backflow into the engine
• One-way exhaust valve design
• Fits Y-pipes with 2.98″ cross-pin diameter
• Heat-resistant construction
• Corrosion-resistant materials
• Direct replacement for worn or damaged shutters

Benefits:

• Helps prevent water ingestion and hydro-lock
• Protects engine internals from corrosion
• Maintains proper exhaust system function
• Easy installation during exhaust servicing
• Mercury-approved fit and reliability

Typical Applications:

• MerCruiser sterndrive engines
• MerCruiser 4.3L V6 applications
• Selected V6 and V8 engines with single-piece manifolds
• Y-pipes featuring a 2.98″ cross-pin diameter (verify fitment by engine serial number)

Installation Note:
Mercury commonly recommends inspecting or replacing exhaust shutters whenever exhaust manifolds, risers, or Y-pipe components are serviced. Some applications require two shutters per engine.

Category:
Exhaust System Components

Tags:
Mercury, MerCruiser, Water Shutter, Exhaust Flapper, Exhaust Shutter, Y-Pipe Flapper, 807166A2, 4.3L V6, Sterndrive, Water Ingestion Protection, OEM Mercury

SKU:
807166A2