I don't know, I went outside, hooked it up. Open valve, gauge would come up. Close valve and it would drop back down to 20psi.
So I openned the valve again. Turned the can upside down. It came up to 32-35psi, closed the valve and it stayed at 33psi...
134a is heavy, and there is stopleak and oil in there, all it states on the can is to add as a gas hold upright..
I have video... But don't want to show it if it's incorrect. But almost wasted the can until I turned it upside down...