Hey Ben,
Your best bet is to hire and irrigaton company who has a "valvee finder" tool to find your valves. The tool is very costly to buy yourself. To check for valves, ffollow the wire, look around where the water is connected t you main source, if the backflow is inside follow the pipes leading dfrom it outside, or poke around with a pole on your lawn, because sometimes its buryed. Your best bet is to callan irrigation company
Thanks
Ray
Rays Above and Beyond Automatic Lawn Sprinklers
Thanks
Ray
Rays Above and Beyond Automatic Lawn Sprinklers