Thermostat-180 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. Offset design, air relief valve, and OEM style seals included where applicable. Bypass Diameter: 1.69 in Bypass Length: 1.71 in Gasket/Seal Material: Rubber Number Of Seals: 1 Prop 65: WARNING: Cancer and Reproductive Harm - www.p65WARNINGs.ca.gov Flange Thickness: 0.05 IN Gasket Or Seal Included: Yes Height: 2.23 IN Height Between Flanges: 1.56 IN Installation Tool Included: No Jiggle Pin Weep Hole: Yes Seal Type: O-Ring Sealing Flange Outside Diameter: 3.31 IN Start to Open Temperature: 180 Deg. F