Im new to kegging. I got used kegs a couple months ago. I designated one a root beer keg and made some root beer. I put it in my keezer and connected the gas to it. I had previously tested it to hold pressure for an extended period of time. My co2 tank was empty by the morning. The same co2 connect was used on a different keg with no problem. Basically it doesn't seat right (i think). When I connect the gas it pressurizes the tank but if you were to push ever so slightly on the connector you can hear gas escaping, yet it doesn't leak when nothing is connected to it. Do I need to buy new post plugs or would new o-rings make any difference. Is is this too much of a grey area to diagnose with these facts?