Water Shutter Exhaust Flapper for Mercruiser 3.0L, 3.7L Replaces 18-2727 60930

Water Shutter Exhaust Flapper for Mercruiser

This water shutter exhaust flapper for Mercruiser 3.0L and 3.7L engines replaces OEM cross-reference numbers 18-2727 and 60930, controlling the flow of exhaust and water through the marine exhaust system.

Overview

The water shutter exhaust flapper for Mercruiser is a direct replacement marine exhaust component that stops water from surging back into the cylinders when the engine shuts off. This water shutter exhaust flapper for Mercruiser 3.0L and 3.7L models works as a one-way gate in the exhaust outlet, and it is made for boat owners and marine technicians replacing worn flappers with OEM cross-reference numbers 18-2727 or 60930.

Built For Performance

• Replaces OEM cross-reference numbers 18-2727 and 60930
• Designed for Mercruiser 3.0L and 3.7L engines
• Functions as a water shutter in the exhaust outlet
• Helps prevent water backflow into the manifold and cylinders
• Direct replacement for marine exhaust flapper applications

Fits These Machines

• for Mercruiser 3.0L
• for Mercruiser 3.7L

On-The-Job Use

• Used in Mercruiser marine exhaust outlets to keep water from re-entering the engine
• Commonly replaced during exhaust elbow or manifold service on 3.0L and 3.7L engines
• Helps maintain one-way exhaust flow after engine shutdown
• Installed in raw water cooled exhaust systems to prevent backflow

Specs At A Glance

Good To Know

Q: What does this water shutter exhaust flapper do? A: It acts as a flapper in the exhaust outlet to block water from flowing back into the manifold and engine after shutdown.

Q: Is this a direct replacement part? A: It is designed for Mercruiser 3.0L and 3.7L engines and is listed as a replacement for cross-reference numbers 18-2727 and 60930.

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