The Sierra 18-4457 Exhaust Protector Valve helps prevent following water from entering the marine exhaust system in Mercruiser applications. It replaces Mercruiser 12644A1.
Includes:Â Stainless Steel Clamp
Size:Â 4" or 101.6mm
Compounded rubber flapper valves prevent water from entering the exhaust system
Made with weather resistant EPDM with U/V stabilizer
Kit Contains:
18-710-72-2Â :Hose Clamp-4-1/16 To 5
Need help with fitment? Contact us with your engine model and serial number and we'll help check suitability.
What is Sierra 18-4457?
Sierra 18-4457 is an aftermarket exhaust protector valve for Mercruiser applications.
Which part numbers cross-reference Sierra 18-4457?
This listing cross-references GLM 89250, Mercruiser 12644A1 and Mercruiser 12644Q01. See the Cross References & Alternative Products section above for linked alternatives where available.
How can I check whether Sierra 18-4457 fits my Mercruiser application?
Contact us with your engine model and serial number and we'll help check suitability.
Australian Dollars
