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Re: check valve for CO2 neccessary?

Maybe not necessary, but a wise investment when you can use a $1 plastic
airline check valve to protect a $65 tank, $65 regulator and $20 needle
valve. The water WILL flow back through the tubing because of capillary
action if the CO2 cylinder ever runs empty. And if you use a bubble counter,
every time you open the bubble counter to refill it, the water from the tank
will come a pouring. Mine did anyway, so the check valve is a convenience
thing too.