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Some people have devised ways of using an air compressor to refill a CO2 tank. A typical air compressor won't reach much above 120-150 psi which is well within tolerances. This strategy might be so that an individual can store and use compressed air away from a stationary installed compressor, such as filling a flat tire on a large automobile somewhere remote. Compressed air remains air, a gas, and the CO2 tank is designed to store liquid, not gas. This practice is dangerous and could lead to a tank rupture and injury to the operator.Some people have devised ways of using an air compressor to refill a CO2 tank. A typical air compressor won't reach much above 120-150 psi which they believe is well within tolerances. This strategy might be so that an individual can store and use compressed air away from a stationary installed compressor, such as filling a flat tire on a large automobile somewhere remote. Compressed air remains air, a gas, and the CO2 tank is designed to store liquid, not gas. This practice is dangerous and could lead to a tank rupture and injury to the operator.