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On my Marshall 254, it says to "point" the black lever near the top of the 2-stage regulator to the tank you will be using first (the "Service" tank). Then open both tank valves (always slowly because of the check valve in the pigtails). The indicator on the top of the regulator should turn green showing the Service tank has propane. When it goes empty, the green indicator will turn red but the reserve tank is now supplying the system. To take out the Service tank, it says to rotate the black valve over to the reserve tank before disconnecting. Is this yet another scenario?
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