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Should flip to green right away, if the other tank is full. However, some of the regulators have been known to react a little slow. Our original regulator never did seem to drop the red flag fully when a tank was empty so I learned from that to switch whenever I saw any red showing. Then eventually the regulator began to leak around the lever. When I replaced it, the new one drops the red flag completely when the tank is empty and the green flag displays immediately when the lever is switched.
Orv
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