The pressure doesn't change when you close the tank valve, as the pressure in the space between the valve and the guage hasn't changed. Slowly back off the reg from the tank until it just starts to leak- the indicator on your pressure gauge will drop.

No drop as described just means that you're not leaking.
rhizome Reviewed by rhizome on . question about CO2 regulators How exactly should you read the flow meter? Top of the ball, middle or bottom? Also, does it make sense that the flow seem present even when the switch is off? I'm just trying to ensure I don't have some kind of leak. Even when unplugged, the flow "ball" floats. Right now I have the ball in the middle of the 1. 224 sq ft area. I run the tank for approx 15 minutes, then wait another 30 minutes before kicking in the blower. thanks Rating: 5