4 in Double Check Detector Backflow Preventer

SPECIAL ORDER ITEM. Review Returns Policy before purchase. This double check detector assembly is engineered for installation on water lines within fire protection systems to safeguard against backsiphonage and backpressure of polluted water into the potable water supply. Rated for pressures up to 175 psi and temperatures reaching 140 degrees, this unit provides essential protection where a potential health hazard does not exist. The assembly incorporates a metered by-pass feature to detect leaks and unauthorized water use, while the main body and access cover are constructed from epoxy coated ductile iron for structural integrity. The design allows for maintenance of the first and second check valves without requiring the device to be removed from the line.