mtmy2k, it's my understanding the mechanism on the propane switches automatically, so there is no interuption of fuel to the appliance when one bottle gets empty. The indicator will turn red after this happens, then you turn the valve to the opposite setting and the indicator should turn green. When you fill the empty bottle and put it back in-line, leave the valve as it is. When the other tank is empty the indicator becomes red again, and you swith the valve to the original position. Like I said, thats just my understanding of the system, and I may have understood wrong.
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