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.  O-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 dives
 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.
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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