I saw the one with Oring the other day and was dumbfounded that the pull dump valve is located on the back of the wing, with the usual float ball to catch on things better. I guess they figured it was too easy to just locate it in a convenient spot.
This way when someone catches it on something, they are entangled, then they have buoyance issues due to the escaping gas, then they have to locate and hopefully stop the wing from deflating, which it is doing nicely thanks to those bungees, now in an even more negative position...sinking...
Maybe they figure tech divers are Ok with this after seeing some of the other configurations out there.
Tommy