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When you are able to lift the tank easily once you have taken the strap off and it is not heavy, or your red indication is showing on the tank that is selected.
What I do is always try and do is work off the same tank, say the enterance door side.
When it is low or out, I select the other tank and get it refilled, put back in and re-select it again.
i kind of use the other one as a reserve tank, then everyonce in a while I disconntect them both and take the both to great refilled.
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