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Well, I got the irrigation system working. I had opened the cutoff valve in the basement and nothing happened. Some sleuthing with a flashlight and I found a second cut off valve that the contractor has drywalled over. I used a tape measure to figure out when to cut and made a hole big enough to get my hand in. Once pressurized, the system seems to mostly work. There is a leak in the hard PVC pipe at the backflow preventer. The previous people had tried to repair that with silicone caulk, which completely did not work. I also found at least two of the drip hoses that were broken. There are drip areas that didn't fire up, but I don't know if they have cut hoses or the controller didn't start them. All four parts of the lawn sprinklers seem to work pretty well.
The system is usable until I get someone out to fix the PVC. There is a cutoff valve upstream of the backflow preventer and that stops the leak. This is going to need to be blow out in the fall, it is much too complicated to use the ShopVac on.
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