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Add to CartSierra replacement fresh water cooled thermostat kit. This kit has a temperature rating of 150°F (66°C) and includes a thermostat housing gasket.
California Residents: 
WARNING
Cancer and Reproductive Harm -
P65Warnings.ca.gov
Sierra 18-3618 Thermostat Kit - Raw Water Cooled Sierra replacement Thermostat Kit for Volvo Penta engines. Sierra marine parts are manufactured to meet or exceed OEM requirements. Temperature...
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Sierra 18-8309 Water Cooled Regulator Seal Sierra replacement regulator seal for Mercury Outboards. Interchangeable with: Mercury Marine 18717
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Sierra 18-3615 Thermostat - Raw Water Sierra replacement thermostat for Volvo Penta engines. Temperature Rating: 150°F Interchangeable with: Volvo Penta 3587597
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Thermostat Kit for Mercruiser Engines 160 degree Includes thermostat (18-2555) and gasket (18-3555) Replaces: OEM 27-89656-1 (Gasket) and 99155A-1 (Thermostat)
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