Dorman 902-2127 Coolant Thermostat Housing (Upper) (2004.5-2010 6.6L Duramax)

The Dorman 902-2127 Thermostat Housing (Upper) is a direct-fit replacement engineered to match the fit and durability of the original thermostat housing. It houses the thermostat and helps control coolant flow to maintain proper engine temperature, resisting extreme heat and coolant exposure for dependable performance when the factory housing is cracked or leaking. Features: Restores Factory Function Manufactured From High-Quality Materials Try-On Tested to Ensure Fitment & Service Life Specifications: Air Vent (Bleeder Valve): No Bolt Hole Center To Bolt Hole Center: 4.65 in Bolts Included: No Color: Natural Flange Thickness: 0.787 in Gasket Or Seal Included: No Height: 2.82 in Housing Neck Angle (°): 90 deg Inlet Port Diameter: 2 in Material: Aluminum Mounting Hole Diameter: 0.355 in Mounting Hole Quantity: 4 O Rings Included: No Outside Diameter: 1.95 in Package Contents: 1 Water Outlet Thermostat Included: No