The problem is the check values (safety features) in the lines. It is in the end of the hose, the part that screws on to the tank. A drill will fix it, but the safety feature will be gone, so I recommend both bottle be connected anytime the gas is on.
Also I don't turn both tanks on at the same time, since I want to know when a tank is empty. Yes it means I may have to get up in the middle of the night, but so far I have been lucky.
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