Watts 0111544 2 1/2" SS Double Check Detector Assembly Backflow Preventer (757DCDA Series)

This 2 1/2 IN double-check detector backflow preventer assembly prevents the backflow of pollutants that are objectionable but not toxic from entering into the potable water supply. Its compact housing consists of two independently operating tri-link check valves, two shutoff valves, and four test cocks. It has a cubic foot meter. It features a stainless steel housing and sleeve and is 70 percent lighter than traditional designs. It is designed for non-health hazard applications and may be installed under continuous pressure service to protect against back pressure and siphonage. It is used primarily on fire sprinkler lines when it is necessary to monitor the unauthorized use of water. The maximum working pressure is 175 psi (12.06 bar).