You may have noticed this device on the side of your home or tucked behind a shrub in one of your flower beds. This device is a Reduced Pressure Zone Backflow Prevention Device. Its purpose is to prevent water that is in your sprinkler system from getting sucked back into our water supply. This device is required to be tested each year by the Texarkana Water Utilities to ensure that it is functioning properly. Below are some facts you need to know to help prevent damage to your backflow device.