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.