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hpa threads

Beaker

Hello again
Jul 9, 2001
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If you mean reg to bottle threads then nope - they aren't

They should be, but I've seen a few bottles that wouldn't screw onto regs, mailnly because the regs threaded bit was too long or short for the ones on the bottle.

For instance I once tried to put a "generic" bottle on an AIR and it just wouldn't go, slap on the WDP bottle and it's works like a charm.

I think Phillip is thinking of the Fill adapter - which is different on the gov'nair.
 

Beaker

Hello again
Jul 9, 2001
4,979
4
113
Wherever I may roam
imlr.org
OK, didn't know that.

As for the others - I have no idea why they are different or how many don't fit the "standard" and there will be many combinations that will work. All I can say is I've tried swapping bottles and regs around and have had a few instances when it didn't work.