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Your cart is empty.Sierra's 18-3675 Thermostat Cover Gasket is designed for use with Mercury marine 200-250 HP 3.0L, (DFI and EFI) engines. It is interchangeable with Mercury Marine 27850318, 27-8503181, and Mercury Sport Jet 27-8503181. Each Sierra product meets or exceeds the original equipment part it replaces.
ElectricEye
Reviewed in the United States on February 16, 2022
Exact fit like the OEM
Rich
Reviewed in the United States on December 14, 2022
Worked perfect on a 2005 Mercury Optimax 200. Looks just like the one that came off.
James Hodges
Reviewed in the United States on June 27, 2019
Easy to install, perfect part.
Neal E.
Reviewed in the United States on February 28, 2016
Only resemble real mercury gaskets in shape, but not in material or thickness. I'd only use these as spares in a pinch.
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