Which backflow device can be installed underground?

The installation of backflow devices underground is specifically allowed for certain types. In this case, the Double Check Valve Assembly (DCA) is recognized for its ability to be buried underground. This design is preferred for underground installations due to its robust construction and ability to effectively prevent backflow in situations where contamination could occur.

While other backflow prevention devices, such as the PVB (Pressure Vacuum Breaker) and RPPA (Reduced Pressure Principle Assembly), serve critical roles in preventing irrigation system cross-connection issues, they are not suited for underground installation. PVBs require a minimum vertical clearance from the highest point of the system to the device itself to function properly, which prohibits them from being buried. The RPPA, while effective, also has specific installation requirements that typically necessitate above-ground placement.

Thus, the Double Check Valve Assembly is designed to meet safety and regulatory standards, making it suitable for underground installation in irrigation systems while ensuring continued protection against backflow.