RPZ Plumbers for Testing, Installation and Repair – Minneapolis, St Paul, Twin Cities


Metro Testing installs, tests, repairs and replaces RPZ backflow preventers across the Twin Cities and all of Minnesota.

Call us at 612-221-5888 to get help with your RPZ backflow preventer.

Reduced Pressure Zone or RPZ is known as the industry standard for commercial and residential properties like apartments and condominium buildings. This type of backflow preventer device provides the highest level of protection against contaminants. Their high level of effectiveness makes them also the most expensive type of this device in the market today. They are complicated to install but when done right they are by far the safest and most reliable. Reduced pressure zone assembly devices can be used for any kind of water or plumbing setup that needs the help of a backflow preventer device.

RPZ Testing – Twin Cities

Only a duly accredited tester certified by the local water supplier must carry out the commissioning and testing of this device. Testing needs to be performed on an annual basis to ensure integrity of operation and performance.

RPZ Installation – Minneapolis, St Paul

Reduced pressure zone assemblies is compatible with both below and above ground installation with above ground as the most preferred type. Chemigation is possible with the use of this device. It is required to be installed on a horizontal basis unless it can be configured at the factory for an alternative position. It provides protection for both back-pressure and back-siphonage problems.

RPZ Backflow Preventer

This device works similarly to a double check valve. The main difference is if there is a change in pressure and the flow of water goes in the wrong direction, it is bypassed immediately and allowed to drain out of the system. This offers an extra layer of protection. It is for this reason that RPZ backflow preventer devices are used in hazardous setups like hospitals and morgues.

RPZ Overhaul and Repair

An RPZ overhaul is necessary when there is presence of leakage. The device is designed in such a way to vent water out in case any of the internal components malfunctions. Leakage and venting may occur also if the device was exposed to impact and freezing. As a rule, RPZ devices need to be overhauled every 5 years.

Top Issues that Require an Overhaul are:

  • Presence of debris within the assembly
  • High pressure damage due to water being turned on very rapidly
  • Damage due to freezing

When being overhauled, the assembly for freeze and impact damage will be assessed, all chambers will be flushed to remove debris and all internal parts will be inspected and tested for correct operation. A rebuild kit or overhaul kit may be needed to replace all moving parts.