How to Change Over a Valve for a 100-Pound Propane Tank

Remove the tank from the motor home or trailer and place it in an open space away from flames or sparks. Open the valve to release any stored propane from the tank.

Remove the old valve. Secure the tank to a stationary object using nylon straps and tighten until it stays in place. Close the valve tightly and use the heat gun to melt the liquid weld around the threads of the valve. Turn the valve in a counterclockwise direction. If necessary, use a propane valve wrench and leverage rod to remove the valve.

Turn the tank so that the neck is at a downward angle. Use a dry towel or abrasive pad to remove any residual Teflon tape from the neck. Be certain that no tape has gotten inside the tank. Pour 2 or 3 ounces of methanol alcohol into the tank to trap any moisture.

Apply Teflon tape to the threading of the new valve. Start at the top of the threading, holding the open end of the tape with your thumb. Pull the Teflon tight and begin circling the threading, crossing over the previous line of Teflon until you reach the bottom of the threading. No threading should be visible.

Insert the new valve into the tank by turning it in a clockwise direction. Be careful not to cross over any threading. Continue turning the valve until it is firmly seated in the tank. Use a propane valve wrench with a leverage rod to finish tightening.

Take the tank in and have a certified operator purge and test the tank before filling it.