Double checks, or double check valves as they are sometimes referred to, are devices designed to prevent backflow from happening and thus protect water supplies from becoming contaminated.
The backflow device is made up of two check valves, a safety measure if you will, in case one check valve fails to function properly.
City Backflow Testing are your local backflow experts. Our testing is done in compliance using the USC 10th Edition. You can rest assured that if City Backflow is doing the annual testing your water system will be tested by the best.
