What is a Backflow Prevention Assembly?

A Backflow Prevention Assembly is specifically designed to protect potable water systems from contamination due to backflow, which occurs when water flows in the reverse direction. This can happen when there is a drop in water pressure in the supply lines, allowing non-potable water or contaminants to enter the clean water supply. The assembly typically includes various components such as check valves, which only allow water to move in one direction, and air gaps to further ensure that contaminated water cannot re-enter the system.

The function of this assembly is essential for maintaining safe drinking water standards and preventing health hazards related to waterborne diseases. Its role is critical in irrigation systems, plumbing, and other applications where safe, drinkable water is used.

The other options describe different functions or types of devices that do not serve the specific purpose of preventing backflow into a potable water system.