So, I have been using Stingray Paintball by the BQE to fill up my CO2 tank. Not bad. Is a pain to get there during weekdays with traffics. Yesterday I paid an emergency visit there because my on/off valve was leaking. Possibility the O ring needed to be replaced. Silly me, I bought another tank from them as a backup. Well, this morning, I discovered the tank I bought is currently leaking CO2...by the fail/safe knob next to the opening. I can understand that a small leak like that won't matter for a paintball player. They could have used up all the CO2 before the leak becomes an issue.
See if I can return it and getting credits for it.