older steel 72 rated at 2250 psi

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Ditto. I love the tanks, but I wouldn't even take one for free if it was lined. Or had 1/2 inch threads.

As we are talking about lined cylinders, I might as well toss this point out. Lined cylinders should not be used for NITROX. Even previously tumbled ones should not be used as one can never truly remove all of the epoxy. Well one could but then metal would also be removed which is then another issue.
 
https://www.shearwater.com/products/swift/

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