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You can put an OPV valve on any reg. They are sold at real dive stores,
not the t-shirt shops you are used to seeing.

Steve Lindblom wrote:
> 
> > The
> >regulator needs a pressure relief valve so that you do not lose your
> >hose or damage your drysuit valve in the event of a first stage failure.
> >The intermediate pressure of the reg needs to be set way low , like 60
> >to 80 psi to keep the action of the inflator very slow ( you anticipate
> >and take the pinch off ) and to buy you some time in the event that the
> >drysuit valve sticks.
> 
> Interesting point I hadn't thought much about (I think most of us have a
> tendency just to stick our oldest, tiniest reg on the argon bottle, and
> keep our fingers crossed),
> 
> What are the preferred 1sts for argon use? I can't offhand think of any
> more-or-less current regs that have the pressure relief, apart from the OMS
> inflation reg (which they say is only for air!) though there are a heck of
> a lot of older USD's that do.
> 
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