Description
SIERRA 4 Inch EPDM Exhaust Flapper Valve with Clamp – 18-4457
Sierra 18-4457 is a exhaust flapper valve with clamp for Marine exhaust outlets requiring a 4-inch (101.6 mm) outside flapper valve, including MerCruiser 12644-series applications.
- UV-stabilized EPDM flapper helps limit water backflow into the exhaust system.
- Supplied with a stainless-steel clamp for a 4-inch outside exhaust tip.
- Cross-references MerCruiser 12644A1 / 12644Q01, GLM 89250 and Mallory 9-44001.
- Designed as a direct marine-service replacement where the listed Sierra/OEM reference is specified.
- Compare the original part number, dimensions and assembly configuration before installation.
Fitment for marine engine and drive service parts can vary by model, serial number, drive/gearcase, cooling configuration and prior OEM supersessions. Compare the original OEM number and physical configuration before installation, and follow the applicable manufacturer service procedure and torque specifications.
Specifications
- Manufacturer: Sierra
- Part Number: 18-4457
- Part Type: Exhaust flapper valve with clamp
- Application: Marine exhaust outlets requiring a 4-inch (101.6 mm) outside flapper valve, including MerCruiser 12644-series applications.
- Nominal Outlet: 4 in (101.6 mm)
- Flapper Material: UV-stabilized EPDM
- Clamp: Stainless steel
Interchange / OEM References
- MerCruiser: 12644A1, 12644Q01
- GLM: 89250
- Mallory: 9-44001
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