Have very little experience with the irrigation box and valves for my drip system installed about 16 years ago. Did some troubleshooting with the controller and narrowed it down to a bad Diaphragm. Contacted the sprinkler supply store through email with about 4 or 5 pictures of my valve and right away they identified what I had. Weathermatic Black Bullet Valve which they don't make any longer. Sprinkler Supply Store sent me the link to the correct valve and received it quickly and installed it. Problem solved!