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m87stme@mt*.ch*.se* (Sten Meyer) wrote (Subject: Re: Euro Nitrox Regs):- > Valves [with the screw threads on the outside] have been used on oxygen > rebreathers since the 1950's. Small light rebreather oxygen cylinders have female tops like e.g. blowtorch valve heads have, so they can be refilled easily by screwing them straight into the top of a fullsize blowtorch-type oxygen cylinder to decant. Also, being small and light, they won't damage the threads much if they get bumped against things. But aqualung-sized cylinders, whatever they are filled with, (a) are too big to fill easily by decanting from blowtorch-sized cylinders and so their users won't get any convenience from them having female tops, and (b) due to their size and weight, and momentum when moving, are likely to damage the external threads badly if bumped against something. Billy Williams was right: such official loo-paper ordering divers to have external threads on aqualung-type cylinders <is> asininity and I hereby recommend the world's diving gear makers and users to ignore it. Diving has got on OK since scuba started and some time before that, with internal threads. Brussels should stick to Brussels sprouts and leave diving alone, or ask far more practical prople first.
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