It could work, but I'd be more comfortable with a pressure rated ball valve.
Being a plumber, I'm much more comfortable having the pressure from gases trapped by threaded fittings.
That co2pro is pretty neat looking, I'm already wondering what it has for threads behind the tubing adapters. I might have to get one to check it out and play with(if it's compatible with 120v 60 hz or 12/24v ac or dc).
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