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Add to CartSierra 18-4457 Mercruiser Exhaust Protector Valve - Replaces 12644A1
The Sierra 18-4457 Exhaust protector valve is a compounded rubber flapper valve that prevents water from entering the exhaust system. This valve is made with weather-resistant EPDM with U/V stabilizer. Includes a stainless steel clamp.
Size: 4"
Interchangeable with:
California Residents: 
WARNING
Cancer and Reproductive Harm -
P65Warnings.ca.gov
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