Deringer 30X-BFG-GPM 4" Double Check Detector Assembly

Deringer 30X is designed to prevent non-health hazard pollutants from entering the potable water supply system caused by backpressure and/or backsiphonage. Deringer 30X has butterfly shutoff valves for a short lay length, and dual-action checks for high performance at low and high-flow rates. The gallon per meter bypass is used to monitor unauthorized water usage and is primarily required on fire sprinkler systems.