I tried airing up the chamber to 10 PSI for a leak check but no pressure can be built up. I checked everything and grabbed a bottle of windex looking for leaks. All the air is being vented out of the barrel. The valve is not seating properly. I think that because I modified it where the flow control is on this model I will have to replace the spring with a heavier one. I will try that tomorrow (hopefully) and see if that fixes it. It is acting just like my rainbird 1" when I forgot to reinstall the spring one time. Oops.