I definitely would reject the idea oft left-threaded posts.
Not only for the increase in spare parts, stock costs.
But because our muscle memory is trained from day one we use a water tap
that turn right means close.

A solution to ceiling rolling closed valves should be accomplished
without creating line traps, while maintaining standard closing/ opening
motions.
May be just an off axis knob, like  in early US -divers/ Spirotechnique
manifolds ( axis aiming 'bout 70° backwards)
Matthias

"Porter, Greg" schrieb:
> 
> The other night in a Scott Bonis decompression class he explained why the
> long hose is now moved to the right post - because it fixes the problem of
> my OOA buddy in front being the victim of my left post being shut down via
> rolling the knob along the ceiling - and the fact that rolling along the
> ceiling now shuts down the SPG instead.
> 
> Given the machining abilities today's manufacturers possess, why do we
> continue to deal with this potential of the left post being shut down during
> a roll along the ceiling ?
> 
> > Why not build the manifold so that the left post knob is reverse threaded
> > ?  This eliminates the rolling off problem and it may also simplify
> > shutting down either valve because divers would no longer have to remember
> > righty-tighty and how to apply it to opposing posts.  Shutting down either
> > cylinder would be done by rolling the top of the knob forward... either
> > knob.
> >
> Are there significant reasons preventing this change ?
> 
> Cheers,
> Greg
> 
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