Important: If a backflow device is used with a battery operated controller or any type of shutoff valve, make sure that the backflow device should be install after the battery-operated controller, timer or any type of shutoff valve.
Important: Backflow device (vacuum breaker) cannot be used under a continuous pressure.
Codes do not permit the use of this device under a continuous pressure as the backflow device can stop functioning under emergency conditions. If used under constant pressure, the backflow device can crack and fail due to a pressure surge when downstream valve close
Some municipalities or local water districts, require the use of Backflow / Atmospheric Vacuum breakers. Make sure to check your local city code to see if you need to install this device.