Pair Exhaust Flappers Water Shutters Mercruiser 4.3 5.0 5.7 7.4 305 350 454 502

Pair Exhaust Flappers and Water Shutters for MerCruiser

This pair of exhaust flappers and water shutters for MerCruiser is designed to fit 4.3, 5.0, 5.7, 7.4 engines and 305, 350, 454, 502 cubic inch models, preventing water backflow into the exhaust.

Overview

These exhaust flappers and water shutters for MerCruiser work as one-way valves to keep water from entering the engine through the exhaust system. They are essential for marine engines to avoid hydrostatic lock.

Built For Performance

• Pair includes both flapper and water shutter for each exhaust outlet
• Constructed from durable rubber and stainless steel
• Designed for MerCruiser engines with 4.3, 5.0, 5.7, 7.4L and 305, 350, 454, 502 CID
• Direct replacement for worn or missing exhaust flaps

Fits These Machines

• for MerCruiser 4.3 L
• for MerCruiser 5.0 L
• for MerCruiser 5.7 L
• for MerCruiser 7.4 L
• for MerCruiser 305
• for MerCruiser 350
• for MerCruiser 454
• for MerCruiser 502

On-The-Job Use

• Prevents water from backing up into the exhaust on sterndrive engines
• Replaces degraded flappers during engine maintenance
• Typical for marine mechanics and boat owners

Specs At A Glance

Good To Know

Q: Are these flappers and shutters sold as a pair? A: Yes, the listing includes one pair of exhaust flappers and water shutters.

Q: Do I need to replace both sides? A: It is recommended to replace both to ensure balanced exhaust flow and prevent water ingress.

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