I have a 3 zone sprinkler system but zone 3 has it's heads leaking all he time. I know I've got to find the manifold and change the valve. The problem is I can't find it. There is definitely no visible box . I followed the water pipes and control wires as best as I could, dug up parts of the lawn, even dug up some of my driveway (to my wife's chagrin) but I can't find the valves. Does anyone know any tricks or hints that I can use to find them? Do I have to get a metal detector and go through my...
