Apollo 3/4 in. Bronze FIP Double Check Backflow Preventer with Union Shut-Off Valves

This item with threaded connections is designed to prevent the back flow of polluted water from entering into the potable water supply due to back siphon-age and or backpressure. It has top mounted test cocks for easy testing. Approved by the Foundation for Cross-Connection Control and Hydraulic Research at the University of Southern California. Union end shut-off valves for quick discount during intermittent freezing.