Deringer 30G-OSY-GPM 8" Double Check Detector Assembly

Deringer 30G is designed to prevent non-health hazard pollutants from entering the potable water supply system caused by backpressure and/or backsiphonage. Deringer 30G has OSY valves and dual-action checks. The gallon per meter bypass is used to monitor unauthorized water usage and is primarily required on fire sprinkler systems.