pescador775
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White Stag sold valves and manifolds for the 1/2 inch straight pipe thread (O ring). This might be the same as .750 fine, I don't know. Some SCBA bottles use the same thread as the White Stag valve. Of course, many manufacturers made the 1/2 inch tapered thread which fits older, steel O2 bottles. I believe your medical tank is 26 cf capacity. The medical tanks are very light and buoyant. Probably would be a nuisance.