Exhaust Flap / Non-Return Valve – Fits Volvo Penta 290, SP and DP Series (Replaces 852644)
Exhaust Flap / Non-Return Valve – Fits Volvo Penta 290, SP and DP Series (Replaces 852644) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
Worry-free returns
You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Exhaust Flap / Non-Return Valve – Fits Volvo Penta 290, SP and DP S...
Product Details
This Exhaust Flap / Non-Return Valve is a crucial component designed to prevent water from flowing back into the engine through the exhaust system. It is engineered for a direct fit on a range of Volvo Penta sterndrives, including the 290, 290DP, SP-A through SP-E, and DP-A through DP-C series models.
This part serves as a direct replacement for Volvo Penta part number 852644 and interchanges with aftermarket references such as Repower Marine RM852644 and HSR Marine 911-082.
- Installs via a simple push-on fit to the exhaust system.
- Prevents damaging water backflow into the engine.
- Engineered from durable materials suited for the marine environment.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Volvo Penta | 852644 |
| Repower Marine | RM852644 |
| HSR Marine | 911-082 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
| Brand | Model | OEM Part No. |
|---|---|---|
| Volvo Penta | 290 | 852644 |
| Volvo Penta | 290DP | 852644 |
| Volvo Penta | SP-A | 852644 |
| Volvo Penta | SP-B | 852644 |
| Volvo Penta | SP-C | 852644 |
| Volvo Penta | SP-D | 852644 |
| Volvo Penta | SP-E | 852644 |
| Volvo Penta | DP-A | 852644 |
| Volvo Penta | DP-B | 852644 |
| Volvo Penta | DP-C | 852644 |
Technical Specs
- Product Type
- Exhaust Flap / Non-Return Valve
- Installation
- Direct replacement
- Connection
- Direct fit to exhaust system
- Weight
- ~0.20 kg (0.44 lb)
- Fitting Type
- Push-on fit
- Other Technical Attributes
- Prevents water backflow into exhaust system
What’s in the Box
- 1 x Exhaust Flap / Non-Return Valve (852644)
Installation Notes
- Ensure the engine is completely off and has cooled down. Secure the sterndrive in a raised position.
- Locate the old exhaust flap at the exhaust outlet on the sterndrive unit.
- Carefully pry off or remove the old, damaged flap. Be cautious not to damage the housing.
- Thoroughly clean the mounting surface on the exhaust housing, removing any residue or marine growth.
- Align the new exhaust flap and press it firmly and evenly into place until it is fully seated.
- Check that the flap can move freely and creates a seal when closed.
Troubleshooting & FAQ
How do I know if this exhaust flap will fit my sterndrive?
This flap is specifically designed for Volvo Penta 290, SP (SP-A to SP-E), and DP (DP-A to DP-C) series sterndrives. The most reliable method is to cross-reference your existing part number with the OEM number 852644. Always verify compatibility before purchasing.
What are the signs of a failing exhaust flap?
Common symptoms of a worn or damaged exhaust flap include a distinct rattling or clattering noise from the exhaust area at idle, visible cracks or brittleness in the material, or pieces of the old flap breaking off. A complete failure can risk water ingestion into the engine.
How often should this non-return valve be replaced?
Replacement interval is not fixed, as it depends on usage (freshwater vs. saltwater) and environmental factors. We recommend inspecting the flap annually during routine maintenance and replacing it immediately if it appears stiff, brittle, cracked, or no longer seals correctly.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
Payment & Security
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