MIG Welding Mixed Gas. Argon 75% and CO25% ... 55 cubic feet size. Still have 1100 PSI pressure, or about 60% of gas remaining. This is an " owner tank" purchased from Liquid Air. The tank is currently up for pressure testing next fill. However, Liquid air exchanges tanks and hasn't previously charged for any testing. Liquid air no longer supplies the 55's but will exchange for an 80 cubic foot tank for and upcharge of about $50. So when this tank is empty, give them the 55 and $50 and they will supply you with a new 80 cubic foot tank and there will be no recertification fee. $230 Firm Parksville