Exhaust Flapper 3"
Free returns on all eligible orders
You have 30 days to request a return. All sale items are final sale.
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 doesn’t seal properly after installation, double-check clamp seating and hose alignment; worn or hardened rubber flappers can reduce sealing performance.
Related Products & Accessories
- Browse related exhaust hoses, mufflers, and clamps - Use the store’s Belts, Hoses & Clamps collection to find matching exhaust hardware and hose components.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 1-3 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.