Exhaust Flapper 3″

Help keep water out of your marine exhaust path with the Sierra Exhaust Flapper (3″)a weather-resistant rubber flapper valve made for reliable exhaust flow control.

Key Features

• 3″ exhaust flapper valve
• Weather resistant rubber flapper valve
• Includes stainless steel hose clamp

Product Compatibility

• Marine exhaust systems
• Inboard/outboard exhaust hose and muffler/exhaust protector valve applications

Product Details

• Sierra Exhaust Flapper 3″
• Size: 3″
• Includes: stainless steel hose clamp
• Flapper: weather resistant rubber flapper valve
• SKU (variant): 47-4456

Parts Desk Insights

Best Use Case: Use when you need a 3″ exhaust flapper to help prevent backflow/water intrusion in the exhaust system, and to restore proper flap operation.

Common Issues: If the flapper doesnt seal properly after installation, double-check clamp seating and hose alignment; worn or hardened rubber flappers can reduce sealing performance.

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