Yep that is the one.

I have a couple, one MIB and othe other used but complete.

The second stage is held in place by the pressure of the first stage. There is a membrane that is inside a nipple that expands and causes the friction fit of the nipple inside the nozzle of the second stage. The nipple is an extension of the first-stage tank (pressure vessel).

Once the pressure decreses in the first stage tank, the pressure slowly decreases in the nipple, the pressure of the second stage pushes the nipple/first-stage away, and now you have stagging.

This is VERY similar to the way in which the Vashon models would operate but not as fancy and with the tolerances of the Vashon kits.

Just wondering if the idea of the Vashon creators was influences by this kit? It would appear so...

Jonathan