Integrated Housing Thermostat-189 Degrees w/ Seal Manufactured with OEM quality materials and safety standards by an OE Supplier. Stands up to even the most demanding automotive cooling systems. Manufactured with OEM specifications and processes. Copper case and wax compound assures rapid response to temperature changes in the coolant. Bypass Diameter: 1.28 in Bypass Length: 1.42 in Gasket/Seal Material: Rubber Installation Tool Included: No Number Of Bolt Holes: 4 Number Of Outlet Ports: 1 Outlet Diameter: 1.26 in Prop 65: WARNING: Cancer and Reproductive Harm - www.p65WARNINGs.ca.gov Start to Open Temperature: 189 Deg. F Bleeder Hole: No Color: Silver Gasket Or Seal Included: Yes Gasket Type: O-Ring Grade Type: Regular Material: Aluminum, Steel, Copper Mounting Hardware Included: No