Did you know that the thermostat is a vital element of the cooling system? It should be inspected periodically and changed according to the manufacturer's maintenance schedule. Thermostat Kit (18-3618) by Sierra. This Sierra Raw Water-Cooled Thermostat Kit for Volvo Penta Raw Water Cooled Applications. The thermostat regulates the engine's temperature by allowing coolant/raw water to cool it. It guarantees proper engine operating temperature. Key Features: Kit used on a variety of modern Volvo Penta engines with raw water cooling Using marine-grade components Crafted with precision using superior materials Includes a 150-degree thermostat, an O-ring, and a gasket The thermostat has a temperature rating of 150 degreeF/66 degreeC. Compatible with several Volvo Penta gasoline marine engines from 2002 to the present. Designed for the river, lake, and seawater applications Specifications: Brand: Sea Star Solutions SKU: 18-3618 UPC: 808282270599 Weight: 0.14 LBS Unit Of Measure: EA Manufacturer Part Number (MPN): 118-3618 Compatibility: Volvo Dimensions: 6" x 7.25" x 2" Type: Thermostats Temperature Rating: 150 degree (66 C)