This automatic propane regulator is designed so that you never run out of gas. You open both tanks, but only the tank that is the regulator is drawing gas out of is being used. The indicator will show green, meaning there is gas in the tank. When that tank is empty, the indicator turns to red and the regulator starts drawing off the second tank. When you see the red indicator, you turn the dial to the second tank, causing the indicator to turn green. You can now remove the first, empty, tank, without turning off the second tank, thus, gas flow in never shut off. Fill the first tank, reconnect, open valve, check for leaks, and you are good to go!
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400,000 btu Automatic Changeover Regulator$78.91
When the service cylinder is empty automatically changes the withdrawal to the reserve cylinder with no interruption of service. Can handle up to 400 000 btu/hr. 528B