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It, too, measures 3/4"-16... except the tank will only screw partway onto the Govnair reg.
I have little doubt that I could get a 3/4"-16 tap, and very lightly clean up the tank threads
and it would fit. (Presuming that this particular tank wasn't condemned, that is.)

But it's interesting that something's stopping it. Is the Luxfer tank, in fact, some oddball metric pitch?
A proprietary 19mm x 1.6 or some such thread? I admit I've always wondered why the PBMania
reg had such a short shank compared to other regs...





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