> 22 Oct 96 18:40, Beery Miller wrote to Alex Viera:
 >  BM> The quality of the cylinder has nothing to do with an O-ring.  
-rings
 > are
 >  BM> replaced very often.  When I take a group of students out from our 
dive
 >  BM> shop (6 to 8 students), by the time we have completed our 4 tank 
ives
 >  BM> over two days, I have replaced one or more O-rings.
 > Remember the days back before the valve manufacturers decided to go to
 > the "captured o-ring" concept?  It was supposed to allow higher air
 > pressures for the tanks of the future.....what a joke.  Those old fat
 > o-rings would often last two years.....in a rental tank!  Now you're
 > lucky to get 3 or 4 dives out of one.
This was way before my time, but thanks for the info.  One learns something 
just about every day.
Beery
 > If you want a true captured o-ring design that is adequate for *much*
 > higher pressures, to my way of thinking there is only one way to go: the
 > DIN connector.  The old AGA Divators and Poseidon Cyclons could easily
 > handle 4500 psi without you worrying about bumping them on a rock.
 > Jay
 > PADI M-9033
 > --- GoldED/386 2.50+
 > (1:379/41.5)
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