Febco 856ST-OSY-GPM 8" Double Check Detector Assembly

Febco 856ST double check detector backflow preventer assembly prevents the backflow of pollutants due to backsiphonage and or backpressure. The assmebly 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, gallons per minute metered bypass and ball valve test cocks.