I purchased a home with an existing Rain Dial Hardie sprinkler system with no manuals or information on the system. The seller went through a divorce and the wife does not know anything about it. All she said that her husband had shut off the water for the sprinkler - where , how she did not know... How do I find the main shut off valve to start the water. What does it look like? I found a water meter and an another thing on the ground near the street that is green and round ( not the centricon ...