622746001 Gas Valve Extension Plug for Norcold Refrigerator 3163 N260 N300 N400 Features: [Function]: The gas valve extension plug is built into the control panel. As long as a flame is present, the valve is open and allows propane gas to flow into the burner. Any loss of flame (empty gas tank, blowout, etc.) closes the safety valve and stops the flow of gas. [Fitment]: For all Norcold refrigerator models: 3163, N260, N300, N400 and N500. Refer to manufacturer recommendations to ensure a proper fit. Quick and easy installation. [How to use]: 1. Open the valve at the gas storage tank. 2. Turn the thermostat to the 5 position. .