Febco 856ST-OSY-CFM 4" Double Check Detector Assembly

Febco 856ST double check detector backflow preventer assembly prevents the backflow of pollutants due to backsiphonage and or backpressure. The assembly has a ductile iron fused epoxy coated body construction, two in-line independent check valves, replaceable stainless steel check seats, outside stem and yoke shutoff valves, cubic feet per minute metered bypass and ball valve test cocks.