I too love the trigger valve and I am on my last powermax supply. The trigger valve stem is not long enough to fit into the neck of the stubby cans so I ordered this valve from Altecare RC. It looks similar to the one you have but has a twist valve on the top. This valve works backwards from what I am used to. To get gas, you have to screw the knob in. So I hooked the stubby can valve to the bottom of the trigger valve and it works perfect.

Roy