How many shut-offs are typically present in a Reduced Pressure Prevention Assembly?

In a Reduced Pressure Prevention Assembly (RPPA), there are typically two shut-off valves present. This design includes one shut-off valve located upstream of the assembly and another downstream. The purpose of having these two shut-offs is to isolate the assembly for maintenance or testing without disrupting the entire water supply system.

The upstream shut-off valve prevents water from entering the RPPA when it’s being serviced, while the downstream shut-off keeps the water supply to the area beyond the assembly intact. This dual shut-off system ensures that the RPPA can be effectively tested for proper function and that the water supply can be controlled in a safe and efficient manner.

It is also important to understand that the RPPA itself serves a critical role in protecting potable water supplies from contamination by preventing backflow. The inclusion of two shut-off valves reflects a standard practice in plumbing design to enhance safety and maintenance capabilities.