12644A1 4-Inch Exhaust Flapper Protector Valve for MerCruiser
12644A1 4-Inch Exhaust Flapper Protector Valve for MerCruiser is backordered and will ship as soon as it is back in stock.
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12644A1 4-Inch Exhaust Flapper Protector Valve for MerCruiser
12644A1 4-Inch Exhaust Flapper Protector Valve for MerCruiser is backordered and will ship as soon as it is back in stock.
SERDAMARINE / MARINE EXHAUST PARTS
4-Inch Exhaust Flapper Protector Valve
This 4-inch exhaust flapper protector valve (referencing Mercury Marine / Quicksilver 12644A1) is made from weather-resistant compounded EPDM rubber with a UV stabilizer for Mercruiser Stern / Out Drive exhaust applications. It is designed to help prevent water from entering the exhaust system in following seas or when backing down, and must be matched by its 4-inch size and external flapper design rather than treated as interchangeable with separate internal water-shutter assemblies or 3-inch and 5/6-inch versions.
Configuration & Specifications
| Nominal Size | 4 inch |
|---|---|
| Material | Compounded weather-resistant EPDM rubber with UV stabilizer |
| Function | Helps prevent water from entering the exhaust system in following seas or when backing down |
Reference Numbers
The following public part numbers are provided as identification references for this 4-inch flapper valve style and do not by themselves establish universal interchangeability or OEM manufacturer origin.
| Mercury Marine / Mariner / Quicksilver | 12644A1, 12644A 1, 12644a 1, 12644Q01 |
|---|---|
| Sierra Marine | 18-4457, 18-4457D |
| GLM | 89250 |
| Mallory Marine | 9-44001 |
| OBR Red Rhino | MR-588 |
| RECMAR | REC12644A1 |
Supplied Parts
- 4-Inch Exhaust Flapper Protector Valve
Service & Installation Notes
General service guidance only. Use the service manual for your exact engine and exhaust configuration.
- Ensure the engine is shut off, cool, and secured against accidental starting before working around the exhaust outlet.
- Inspect the existing exhaust outlet and compare the old flapper valve against the 4-inch size and protector valve profile.
- Clean the mounting surface and check that the flapper opens and closes freely without binding after installation.
- If abnormal exhaust restriction, leakage, or operating noise occurs during inspection or operation, stop running the engine and inspect the exhaust system.
The Serdamarine Approach
Exhaust parts need a configuration match. Serdamarine focuses on marine exhaust manifolds and their related service parts. Application details, connection requirements and public reference numbers are presented together to support part selection.
Questions Before Replacement
Does a 4-inch exhaust measurement mean this replaces any 4-inch water shutter?
No. This part is an EPDM rubber exhaust flapper protector valve referencing 12644A1. A 4-inch dimension alone does not make it interchangeable with separate internal exhaust Y-pipe water-shutter designs.
How is this flapper distinguished from other rubber exhaust flappers?
Similar-looking rubber flappers are also made in 3-inch and 5/6-inch sizes. Match the 4-inch size and the 12644A1 / 18-4457 reference group to ensure the correct diameter.
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