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This is a potential bomb.  Several yrs ago a N Fla dive shop accidently
put the wrong valve, (the threads were close but different) on a tank
and nearly killed himself when it blew up while filling it.  Not to
suggest that I know it, but there is a science to thread making for high
pressure/ strength applications.  The number of threads, their depth and
other factors are all considered.  Do yourself a favor and buy a new
tank.

Joe C. 


Rob Sluys wrote:
> 
> List,
> 
> Just wondering if anybody's ever tried retrofitting a steel 72 that has the
> 1/2" taper threads to the threads normally used on manifold and other
> non-antiquated equipment?  Just an idea I had out of no where, any ideas?
> 
> On a related note, what exactly is the normal thread size?  I know it's
> 3/4", but what's the thread count?
> 
> Safe Diving,
> Rob Sluys
> 
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