Water Heater Gas Thermostat White Rodgers 37C73U-173

White Rdogers Gas Water Heater Thermostat part number 37C73U-173. For AO Smith.Specifications Inlet Size 1/2 NPT Outlet Size 1/2 inverted flare Mounting 3/4 NPT, 4-1/2 bulb insertion length Pilot Connection 1/4 compression fitting Shank Length 1-1/4 inch Application Natural Gas Water Colum (WC) 4.0 Main Main Burner 4.0 Pilot Temperature Range 70 to 160F (21 to 71C) Threaded Right Hand Replacement for 37C73U-641 Features Automatic shut-off of main and pilot gas in the event of pilot failure Pilot gas cock with safe lighting feature and filter Temperature adjustment Manifold pressure tap Built-In E.C.O. (Energy Cut Off) non-cycling high limit