GAS VALVE, White Rodgers (An Emerson Brand) #37C73U-268, Storage Tank Manual Water Heater Temperature Control Gas Valve. For Natural Gas Only, 3.5" WC, 40,000 BTU/hr., with 1/2" deep Brass Temperature Sensor Probe Insert Housing. This gas valve is used on AO Smith, State, WKing, Protech, Rheem, Ruud, Vanguard & Lochinvar This Gas Valve has been Cleaned & Bench Tested for proper function & temperature accuracy. This is a Pre-owned Gas Valve & is sold with a 90-day Warranty if Installed by a Licensed Plumber.