on/off help

[greensplash]

Upon airing up the valve with the sear out of the gun to see the on/off it comes out when first aired up then I can push it in with an allen wrench and nothing happens and it does not reset.
http://i15.photobucket.com/albums/a376/heisman01/826af7d3.jpg
http://i15.photobucket.com/albums/a376/heisman01/33136e21.jpg
my on/off for an emag valve previous owner used the emag valve and chance this is the wrong on/off?

Any ideas on what could be causing this?

[kcombs9]

is that a ULT on/off? looks like it has shims on it an no double o rings on the top.