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>It's not only the serial numbers. You have to make sure that the
>tanks have been rolled in OPPOSITE directions; the metal grain inside
>is more incurved on one side than the other, so, as the tanks empty,
>there is a radial vortex generated inside the tanks which, unless
>cancelled by an identical vortex in the other tank, would threaten to
>spin around the diver, thus maximizing the effect of narcing. 
>etc. etc.

Gee, shouldn't I have a valve with a left hand thread in my left tank?  I
drained the gas out of my 95's to check and found that there was a left hand
thread on the isolator but both of the tank necks were right hand thread. 

Should I retap one neck of one of the tanks?  Maybe use a RH thread on the
LH grain structure tank and a LH thread on the RH vortex tank? 

BTW, does the grain structure induced vortex help with the mixing when I'm
partial pressuring? 

Tim Taylor   
taylor@ru*.ne*

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