I have six old Rain Bird inline sprinkler valves on 1" sprinkler lines. They are buried about 18" in the ground. Last time the sprinklers were on one circuit never shut off. I had to turn off our pump to get that sprinkler to shut off. So I have a problem with one of the imline valves. The real problem is that I do not know which valve is defective. Needless to say, I do not want to start digging up 1" pipe and replacing valves needlessly. Is there a way to turn off old sprinkler valves manually so that I can test them? Other suggestions would be most welcome.