The 200 and 300 bar fittings are so that you can use a 300 bar reg on a 200 bar tank, but not the opposite. The 300 is deeper/longer, so if you try to screw a 200 male in a 300 female, he's gonna have ego problems cuz his gun is not gonna be big/long enough for the touch down. On the other hand a 200 female will be pretty happy with a 300 male. As far as I know ScubaPro reg din addaptors are all 300 and the valve is 200 (in size regardless of the operational pressure). take care, Ed.
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