If they will shut down they should not be used in the first place. An overrelief valve on a primary regulator could be a death sentence. The seccond stage will freeflow on a proper , downstream second and tell you that the first is blown, so you canturn it off. On an argon bottle, there is no second stage, so you use an overrelief valve so you don't lose the hose or damage the drysuit valve. There is no there reason to do this, and there cetainly is no reason to use a bad reg, or a Jetstream, which makes no sense at all. Only a real rocket scientist would convince himself to use a reg with this much intermediate pressure or a regulator that could lock up. I love it when people tell me that gear config never killed anybody. How do you guys think people get screwed up enough under water to die in the first place? It is their shittly gear, sloppy congfig, lack of prepartation, bad attitiude, and appliction of stroekry that combine to do it. Guess what - it is always the same people that do all of these things at once. Finding solutions for problems you yourself have created is nuts. -G
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