Soaking multiple Reg sets (DIY Manifold)

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As long as you use your lowest IP reg as the one attached to the tank, the other regs HP valve never closes (IP side doesn't get to THAT reg's IP setting, so HP seat remains open) and that provides the failsafe of air out vs. water in from a poorly sealed dust cap.

Yep, you're right about that, at least in theory. It's a neat idea if you like to soak your regs pressurized and you have several to do.