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Todd Leonard wrote:
> 
> Does anybody know the real story behind the practice still taught
> by some agencies of turning tank valves a quarter-turn back after
> opening them all the way?  I've "heard" that at one point in time
> there may have been valves where this really was useful, but that
> it has long since become an anachronism (and a potential point of
> confusion, albeit a small one, for someone who wants to quickly
> ensure their valve is on all the way).  I don't turn mine back,
> but on a couple of occasions some well-intentioned buddy or DM
> has "checked" my air supply and turned it back before I explained
> it (and in the case of the DM, just politely asked them to leave
> me and my gear alone).  Obviously, I'd prefer to know the whole
> story before explaining to these guys why it's a stupid "rule".
> 
> So what's the truth?  Was the quarter-turn back ever a good idea?
> 
> - Todd
> 
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I believe the 1/4 back turn idea was to prevent someone from trying to 
force open an already open valve on an empty tank

Marv

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