Bizjet oxygen refill fitting - what is it?
 

I am looking for an adaptor which screws onto a U.S. 540 oxygen cylinder and which accepts the standard hose used to refill business jet cylinders at major airports around the world.

The hose fitting in question is a small fine thread - about 1/4" OD, I vaguely recall. It *may be* Puritan Bennett but really I haven't got a clue. Nobody I know knows what it is - even people who work on big turboprops.

I can think of several
 

Male or Female?

The standard one is FA-540 of course but there is a Puritan Bennett adaptor. And a Scott.

There are pictures on Aviation Oxygen Refill Stations
is it not there?

The 540 thread I know well - that is what the US cylinders have. But this is big - about 20mm dia. The thread I have seen is about half that size.

Are you saying there is more than one "standard" and that when a King Air pilot lands somewhere and needs his emergency o2 topped off, somebody needs to mess around with adaptors? This may be so, in which case there is no simple solution.

That URL is dead, currently. This one might be relevant, perhaps, but I cannot see enough detail.

Emergency O2
 

If its an adapter for refilling walkround/emergency O2 bottles, the one we use is part number MC1100, maker unknown, unfortunately. Hope that helps.

Cheers