Make sure its the right valve to fit your gun, because they are gun specific.
It is, It worked fine on the first pump, 50 - 190 no probs, then I had it out for a while and it was below 100, thats when I couldnt get it back above 150, then I shot it well below 50 and cant get it back up.............
How does the filler pipe attatch to your gun, is it the baonet type, or screw on?
It kind of clips in, you pull it back, push it on and it snaps on...