I've got a set of emergency inflation valves fitted already - they were the source of most of the leaks! Stupid things.
The way mine are plumbed in mean the they share the pressure in each airbag pipe with the solenoids so I'm not sure how that would prove anything.
Each of the 4 output pipes from the EAS box has a t-piece on it which goes to the airbag in one direction and the valve in the other. I'm assuming inside the EAS box it's going to the solenoid...
Gotta pic somewhere but I can't get it off my phone at the mo...