I'm guessing that each valve has a built in AVB or PVB. Here you have to have a separate backflow device on all systems. I.e. not on the valve. It goes in right after the meter on the customers side of the meter.
Scag, Exmark, Honda, Shindaiwa, Redmax. Commercial and residential Lawncare, Irrigation (LI and BPAT), and Landscaping. Fully insured.
Mikegyver Pics Thread
People pay you to hold their hand. If you don't like doing it, then you are in the wrong business.