Had a bad day/night I charged up my little 13cu tank and when I purged the line it just emptied all the air out the purge valve on the compressor. So I had to put a new o-ring on the check valve. Immediately after that I filled my Impact with the 480 bottle on it. When I tried to take the bottle off to put the 580 on the 480 just completely emptied itself So what do I need to do to get the valve off of the tank so I can replace yet another o-ring?