Pair of Shutter Water Flappers Exhaust Y Pipe for Mercruiser replaces 807166A3

Pair of Shutter Water Flappers for Mercruiser

This pair of shutter water flappers is designed for Mercruiser exhaust Y pipes, replacing OEM part number 807166A3 to control exhaust flow and prevent water reversion.

Overview

These shutter water flappers are a direct replacement for Mercruiser exhaust systems, specifically for the Y pipe assembly. They function as one-way valves to allow exhaust gases out while blocking water from entering the engine. Sold as a pair, they match the original specifications for reliable performance.

Built For Performance

• Constructed from durable rubber to resist water and heat
• Exact fit for Mercruiser exhaust Y pipes
• Replaces OEM part number 807166A3
• Sold as a pair for dual exhaust setups
• Prevents water reversion and protects engine internals

On-The-Job Use

• Used in Mercruiser stern drive engines with Y pipe exhaust systems
• Commonly replaced during exhaust system maintenance or repair
• Ensures proper exhaust flow and prevents water ingestion during idle or shutdown
• Ideal for marine mechanics and DIY boat owners

Specs At A Glance

Good To Know

Q: How do I know if these flappers fit my Mercruiser? A: These flappers are designed for Mercruiser exhaust Y pipes using OEM part 807166A3; check your current part number and engine model to confirm fitment.

Q: What is the purpose of shutter water flappers? A: They prevent water from flowing back into the exhaust system, which can cause engine damage, while allowing exhaust gases to exit freely.

Slight variation in finish or dimensions may occur between production runs, and fit can depend on serial number, so confirm compatibility before ordering.