The proper backflow protection is so vital to your family’s health. Here is how the state defines a situation requiring protection: “Any Irrigation system connected to a potable water source shall be protected against backflow by a backflow device.”
In New Jersey there are only two (2) devices allowed by the State for correct backflow protection and both of them are used for different situations. One is a Pressure Vacuum Breaker (PVB) and the other is a Reduced Pressure Vacuum Breaker (RPVB). A PVB is installed when the device calls for an installation where the device can be installed twelve (12) inches above the highest sprinkler head. The RPVB is to be used when the device is less than twelve (12) inches above the highest sprinkler head along with some installation restrictions. The majority of installations require the PVB, and it is the standard of the industry.
Please be sure that the contractor you have gotten an estimate from is giving you a price that has the proper backflow device included. Also, please be sure that the contractor is State Certified. A State Certified Landscape Irrigation Contractor is required to display his Certification # on his trucks.