To add to what David Drake said, the usual failure point other than the yoke 
allowing the o-ring to shave when bumped, is for the knobs to be knocked off of 
the manifold. This means yu can not turn off your gas inthe event of a reg 
failure. With the DIN manifolds, you can get an isolator which will allow you
to 
save one tank in the event that these two things occur. Since the knobs stick 
out to the sides, this is a common occurrance. The isolator has the same number 
of o-rings as the solid bar, so don't tell me about more failure points. Now
you 
need to have a manifold whre the o-rings in this part are barrel, not face.
This 
means avoid OMS, Sherwood, GSD and other gargbage, and use Scuba Pro, Dive
Rite, 
or Sea Elite. 

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