What is the role of a test cock in a backflow prevention assembly?

The primary function of a test cock in a backflow prevention assembly is to establish flow for testing. Test cocks are small valves that provide access points for testing equipment to measure the functionality and effectiveness of the backflow prevention device. During testing, water flow is allowed through these cocks to evaluate whether the assembly is properly preventing backflow, which is essential for ensuring the safety of the potable water supply.

Test cocks are instrumental in confirming that the backflow prevention assembly is operating as intended by providing a way to simulate conditions and measure the differential pressure necessary for assessing the performance of the device. This functionality is critical for regular maintenance and compliance with safety standards in water systems, thereby helping to safeguard public health from potential contaminants.