If you choose bulk size tanks and equipment to refill portable CO2 cylinders, the smallest size bulk CO2 tanks range from 20 lbs. and up to 35 lbs.; these tanks look like scuba tanks and can be bought online at paintball shops that sell equipment for commercial fields. Another great source of bulk CO2 tanks are companies that sell welding supplies.
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OXARC® Inc., provides welding and industrial supplies, safety products & training, as well as industrial, medical and specialty gases.OXARC is a family owned business operating in 21 locations across the Northwestern USA since 1968.