160 degree thermostat kit used on Volvo Penta 3.0L 4 cylinder marine engines. 160 Degree Thermostat Kit | Sierra 18-3621 Fits Volvo Penta 3.0L GL, 3.0L GSP, 3.0L GLP and 3.0L GLM model marine engines from 1996 to present Kit includes a 160 degree thermostat , sealing ring and 18-0164 gasket