Installation Guidelines

Installing or replacing a Backflow Prevention Device

Backflow Prevention Device can be installed almost anywhere as long as you follow certain specific guidelines for each device.

Reduced Pressure Zone 

These devices are the most complex Backflow Prevention Device,  with two check valves and a relief valve.  Suited for high, medium and low hazard, protects against backpressure and back siphonage.

Installation Requirements of an RPZ

  • Never install in a pit or where the relief valve can be submerged
  • Must be installed with an airgap to eliminate a cross connection between the relief valve and the non potable water source
  • Must be installed in a room with a drain or have a proper plumbing from the relief valve to a drain
  • Must be installed horizontally
  • Must be installed at least 12 inches off of the ground
  • Must be installed with adequate room for testing and service
Double Check Valve Assembly

This Backflow Prevention Device has two independent check valves for redundancy and are best suited for medium to low hazard, can be installed in more places than an RPZ can but only protects against backpressure.

Installation requirements of a DCVA

  • Can be installed in any orientation
  • Can be installed in a pit
  • Does not require a drain
  • Must be installed with adequate room for testing and service
Pressure Vacuum Breaker

A Backflow Prevention Device suited for any degree of hazard, with one check valve followed by an air inlet valve.  This device is only designed to protect against back siphonage not for backpressure.

Installation Requirements of a PVB

  • Must be installed at least twelve inches above the highest downstream outlet
  • Must be installed vertically
  • Can not be installed in a pit
  • Does not need a drain

Installing 2 new Watts RPZs

*All installations & repairs of Backflow Prevention Devices are subcontracted to a licensed NJ Master Plumber.*

Best Locations for Installation

Installations for devices are going to vary due to their intended use,  some devices are intended to be used for isolation and some for containment.  Backflow Testing Services works with the best master plumbers in the state to make sure your installation is up to code, conveniently placed and professionally installed!

Suggested locations for a Backflow Prevention Device

At or near the water meter– This is the best location to install a Backflow Prevention Device for a device that is protecting against containment.  This can be inside or outside but we always suggest to have the device installed inside of the building.  This way the device is protected against the elements as well as potential thieves.  If this is not an option a hotbox is a great solution to this problem, they offer great protection against the elements while also protecting against tampering with the device.

Outside unprotected–  When installing a Backflow Prevention Device outside it is always suggested to have the device in some sort of security enclosure or a hotbox to prevent freezing and tampering.  In a situation where the device cannot be installed with these enclosures, we suggest that the device gets drained, blown out with compressed air or removed during the winter months to prevent damage from freezing.  This is most commonly done on lawn sprinkler systems.

Cost of installation

No two installations are ever the same, small changes in location, diameter and/or type of backflow prevention device will reflect in a change of price.  Call us to schedule a free estimate on an install and backflow test today!  *All installations & repairs of Backflow Prevention Devices are subcontracted to a licensed NJ Master Plumber.*