Febco 856ST-LG-GPM 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 without shutoff valves has a ductile iron fused epoxy coated body construction, two in-line independent check valves, replaceable stainless steel check seats, gallons per minute metered bypass and ball valve test cocks