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Your cart is empty.The Sierra 18-4457 Exhaust Protector Valve features compounded rubber flapper valves which prevent water from entering the exhaust system. Designed to be interchangeable with the following: GLM 89250, Mallory 9-44001 Mercruiser 13644Q01, 12644A1. Each Sierra product meets or exceeds the original equipment part it replaces.
michaelanne gayosso
Reviewed in the United States on August 16, 2023
Fits and is true to the size chart.
Cw1035
Reviewed in the United States on April 3, 2022
Product is new and fit great only problem is shipping was slow
JKD and Crew
Reviewed in the United States on August 23, 2019
Fit great and works like it should
R Stringer
Reviewed in the United States on September 13, 2016
Poor Quality compared to Mercury.The original I replaced was a mercury/quicksilver. It was alot better quality, Thicker,
ted wicks
Reviewed in the United States on August 19, 2016
works good
Robbie
Reviewed in the United States on September 3, 2015
Worked great, great quality!
Gregory N
Reviewed in the United States on September 10, 2015
Perfect fit. Works great
Greggers
Reviewed in the United States on May 12, 2014
Purchased this product for my 2007 Moomba Mobius. One of my original exhaust flaps started to tear at the flapping joint and then tore off. Purchased the 4" exhaust protector valve and had to cut it to size by removing about an inch of material from the collar. Cinched it down with the provided hose clamp and it fit just right. Should work just fine.
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