Integrated Housing Thermostat-221 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. Bolt Hole Quantity: 4 Bolts Included: No Color: Silver Gasket/Seal Material: Rubber Hardware included: No Installation Tool Included: No Jiggle Pin Included: Yes Material: Aluminum, Stainless Steel, Copper Mounting Hardware Included: No Bleeder Hole: Yes Gasket Or Seal Included: Yes