30-50 CF Tank?

Not aware of any airgun-centric dealers selling one, but any 30-minute SCBA "fireman's" tank (MSA, Scott) is 45 cubic feet.
Thanks, think I may have been aware of that already. I have looked around & think I have found some on Ebay, but been hesitant to buy.
What I don’t know is: Does it fit the same valve system as I have on my Omega 75 for example? Are those threads universal?
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