Which equipment is specifically used for testing a pressure vacuum breaker?

The equipment specifically used for testing a pressure vacuum breaker is the differential pressure gauge. This device is essential for measuring the pressure differential across the pressure vacuum breaker, which indicates how effectively the device is functioning in preventing backflow.

In the context of backflow prevention, a pressure vacuum breaker operates by maintaining a specific pressure to avoid the siphoning effect that can lead to contamination of the potable water supply. During testing, the differential pressure gauge helps determine if the device is maintaining the proper pressure differential required to prevent backflow under varying flow conditions.

Other types of equipment, such as a pressure gauge, flow meter, or water level sensor, serve different purposes in plumbing and hydraulic systems but do not provide the necessary measurement specific to the function of the pressure vacuum breaker. Therefore, the differential pressure gauge is the ideal tool for this testing process.