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I got a call to fix a system where 5 zones are stuck on a football field. All valves buried with one sprinkler per zone. I chopped through wires trying to find the valves, and snapped the PVC mainline at a tee trying to unscrew a valve. They used copper for swing arms with no elbows which have kinked over time from 35 years of machinery driving over them. Nightmare really. I have given them a price to start again. Only half the field is actually getting watered due to the poor layout (which may have been ok originally)
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