Machined Stainless steel Adjustment knob.

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It probably won't work, because the G200 barrel is much shorter. The cap that threads in is hollow so the spring rests against the bottom of the cap outbound of the barrel. You need a barrel that extends outside of the case, I believe. I have had several of the G200B 2nd stages, I think they are under-rated. Tuned well, they are just as good to dive with as the G250, actually a bit lighter as well.
Does the cap have some sort of adjustment screw?
 
Does the cap have some sort of adjustment screw?

It has a female hex fitting molded into the cap, I think 6 mm. So you could theoretically take a 6mm allen wrench with you on the dive and adjust it. I'm not sure of the range or how reliable it would be.
 
https://www.shearwater.com/products/peregrine/

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