I blew and sucked. Thought about a check valve. Blew and sucked from the gas in fitting and blew and sucked in both the gas out fittings.
He he he he he he he he he he he.
You probably won't be able to move the check valve wither way. IIRC most vales take at least 5 psi to open in the correct direction. The average human can only produce 1 - 1.5 psi.
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