Sierra 18-4456 Exhaust Flapper 3 Inch Marine Transom

The Sierra 18-4456 is a 3-inch marine exhaust flapper designed to prevent water from entering your boat's engine through the exhaust system. This essential component mounts at the transom exhaust outlet and acts as a one-way valve, allowing exhaust gases to exit while blocking water intrusion when the engine is off or during wave action.

Key Features:

• 3-inch diameter fits standard marine exhaust outlets
• Weather-resistant rubber flapper valve construction for durability in harsh marine environments
• Includes stainless steel hose clamp for secure, corrosion-resistant installation
• Prevents water backflow into exhaust system and engine
• Direct replacement for worn or damaged exhaust flappers

Regular inspection and replacement of your exhaust flapper is important preventive maintenance to protect your marine engine from costly water damage. The stainless steel clamp ensures a reliable seal that withstands saltwater exposure.