I think a K might be a 244 cu. ft. Argon would come in a 122 cu. ft. size not 150. However if you do the math, it's $108/yr to lease x 3 years equals $324, without being filled, but you still have to keep paying every year. Up here a 122 argon costs $325 and comes filled with argon. In the long run it saves a lot of money to buy the cylinders outright. $150 is a good deal BUT only if one of the local welding supplies will exchange it. If it's a Praxair K cylinder, it was never available to be sold and you'd have to take out a lease on it anyway.
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