In plumbing, what does RPZ stand for?

In plumbing, RPZ stands for Reduced Pressure Zone. This term describes a type of backflow prevention device that is designed to protect the potable water supply from contaminants due to backflow. The RPZ device maintains a reduced pressure in the zone between its two check valves, ensuring that if there is a backflow situation (when water flows in the reverse direction), water cannot enter the main supply line, as the pressure in this zone is lower than that in the supply line.

The design of an RPZ is crucial for systems where there is a potential for contamination, such as irrigation systems, industrial operations, or chemical processes. The effectiveness of this type of device is recognized by plumbing codes, making it a common requirement in many applications where public health needs to be protected.