Exhaust Flapper Protector Valve for Mercury Boat (4") (Sierra 18-4457, 12644A1, 12644Q01)

Includes: - Exhaust Flapper Protector Valve

Fits Models: - Mercury Boats

Model Years: - Check fitment before purchase

Submodels: - Applies to listed models

Engine Options: - Compatible with standard engine options

Description: The Exhaust Flapper Protector Valve is designed for Mercury boats. This component helps prevent water from entering the exhaust system, which can cause damage and reduce efficiency.

Features: - Durable construction for long-lasting use - Simple installation with compatible Mercury models - Built to fit 4" exhaust systems - Direct replacement for Sierra part numbers 18-4457, 12644A1, and 12644Q01 - Helps maintain engine performance by preventing backflow

Part Number: 18-4457, 12644A1, 12644Q01