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If you lift up the cover to your sprinkler valves and they are covered with water you likely have a leak at a sprinkler valve, or maybe a fitting. If this sprinkler repair is at the sprinkler valve, it typically will be in the top of the valve. This is where the mechanics of the valve are. The bottom of the valve is just a housing, but the top contains the diaphragm, solenoid, wiring and screws.
If you can isolate which valve is the problem, rather than replacing the entire valve, buy a exact replacement for that valve and just replace the top half of it. This will save lots of gluing and problems due to the cramped area you are working in. The valves are usually placed so close together that you can’t replace one without disturbing the others. So by just replacing the top of the valve, you are basically getting a new valve (at least the mechanics) without the hassle of actually digging and cutting.
Make sure after you replace to top half that you tighten all of the screws to the same torque. In many cases, it will create a pressure imbalance that will prohibit the diaphragm from sealing and stopping the flow of water.
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