captain
Contributor
If the dust cap is the type that has an O ring in it soaking is not a problem, been doing it for 50 years.
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I normally soak most my regs unpressurized and have no problem. But I do take extra precautions with those 2nd stages that have a seat saver feature like the Scubapro S600, G500, and G250HP. With those regs, you should turn the adjustment knob all the way in (clockwise) so the LP seat seals against to orifice.