The Series 3000BM1 Double Check Detector Assembly (DCDA) is specifically designed to protect against possible backpressure and backsiphonage conditions for non-health hazard (i.e., pollutant) application in accordance with Local Governing Water Utility Code. This device assembly is primarily used on commercial fire sprinkler systems where Local Governing Code mandates protection from non-potable quality water being pumped or siphoned back into the potable water system. Maximum Working Pressure: 175psi (12.06 bar).