Originally Posted by NY ShaDe 45
that happens to me sometimes when the air in the tank is almost empty. is your tank full? it might not be pressurized enough to push it back. can you push it back with your finger?
He's not talking about the tank reg, he means that actual ASA. With on/off ASAs you have a pin that moves forward (the on position), allowing air flow, when you turn the ASA to the off position, the pin moves back, stopping air flow.