What is the required number of test cocks on a small (3/4"-2") pressure vacuum breaker?

A small pressure vacuum breaker requires two test cocks to facilitate proper testing and maintenance. The presence of two test cocks allows for the necessary check of both the inlet and the outlet sides of the device. This enables a comprehensive assessment of the backflow prevention functionality, ensuring that the device can effectively prevent any potential backflow into the potable water supply.

Having two test cocks allows testers to conduct the standardized testing procedures outlined in backflow prevention device standards. One test cock is typically used to isolate the device for testing the air inlet, while the second allows the pressure readings needed to ensure the breaker is functioning properly. This setup is crucial for effectively identifying any issues related to backflow, ensuring compliance with health and safety regulations regarding water quality.