Exhaust Flapper With Clamp 4 in. | Sierra 18-4457
Exhaust Flapper With Clamp 4 in. | Sierra 18-4457
Sierra
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Exhaust Flapper With Clamp 4 in. | Sierra 18-4457
Sierra 4 in. Exhaust Flapper With Clamp | 18-4457
Exhaust protector valve mounts on the outside of 4 in. exhaust tip to prevent backflow of water into the exhaust.
- For 4 in. diameter exhaust thru hulls
- Prevents backflow of water into exhaust system
- Stainless steel clamp included
- Designed to mount on the outside of exhaust tips
- Replaces Mercury 12644A1, 12644Q01
- Replaces OMC/Johnson/Evinrude 509495
- Replaces Mallory 9-44001
! Compatibility references are provided for informational purposes only and do not constitute a fitment guarantee. Part numbers, application listings, and "replaces" cross-references are based on manufacturer data and are intended as a starting point for identification — not a guarantee of fit for your specific engine, hull, or installation.
Buyer is solely responsible for verifying compatibility with their engine model, serial number, model year, and trim configuration before purchase. If you are unsure whether this part fits your application, contact MacombMarineParts.com before you buy — we're available via text, email, or online chat to help verify compatibility for your specific application.
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