Have a new Carbon Doser check valve. Can't seem to get anything to go thru it. Shouldn't I be able to blow air thru it with my mouth? Does it take a certain psi for the valve to operate?
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Yes I do. I can't blow thru either end.you do know its a 1 way valve (directional)
Need a weaker spring, or no spring... Gravity will stop it.I'm thinking it's defective. I can take it apart and depress the ball with a paperclip but it takes some effort.

