A backflow preventer allows water to flow one direction: from the city water supply to your meter. It prevents possibly contaminated water from flowing back into our drinking water.
It is important to have backflows tested regularly to ensure they are working properly, as there is no way to look at them and ensure functionality.
It is not unusual for backflows to need maintenance, similar to a car. They may need internal parts cleaned or replaced. Turning the handles on your backflow occasionally can help prolong the life of the ball valves.
There are many types of backflow preventers, such as the double-check valve assembly (DC), pressure-vacuum breaker assembly (PVB), and the reduced-pressure assembly (RP).