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I think Air would have to push back on the water to be a problem. The check valve prevents air from pushing back on the water in the bubble counter. I guess it could still leak out if the contactor was open and you disconnected the regulator? The JBJ has a check valve below the bubble counter, so is this a problem?
 

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If the CO2 tank ran dry and then got cold for some reason, and the solenoid was open, could it pull water out of the bubble counter and into the CO2 tank due to contraction?
Think of a straw with water in it. If you fill it up half way with coke and then pull it out of the coke with your finger (check valve) keeping air from entering the top, the vacuum holds the water in place. The Co2 tank would have to suck to get the water out, is that what happens when an empty tank gets cold? We need a second opinion.
 
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