Which of the following is NOT a requirement for a pressure vacuum breaker?

A pressure vacuum breaker (PVB) is designed to prevent backflow in irrigation systems, essentially keeping the potable water supply safe from contamination. For a pressure vacuum breaker to function correctly, certain requirements must be met.

The requirement of having two test cocks allows for testing the breaker’s ability to maintain a vacuum and prevent back siphonage. This is crucial for ensuring that the device operates effectively.

Having two shut off valves is also essential since they permit isolation of the assembly for testing and maintenance. This ensures that the pressure vacuum breaker can be serviced without disrupting the entire irrigation system.

The requirement for installation height, specifically being 12 inches above the highest outlet, is critical for maintaining the air gap necessary to prevent backflow. This height is crucial in ensuring that if there is a drop in pressure, contaminants cannot reach the potable water supply.

In contrast, the direct connection to a potable water supply is not a requirement for a pressure vacuum breaker. In fact, the device itself functions as an air gap to protect the water supply, and a direct connection may potentially compromise that protective measure. Instead, it should be installed in such a way that it maintains the necessary clearance and can function as intended.