Watts 1/2" B911S-M3 Dual Check Valve

This 1/2 inch bronze combination fill valve and backflow preventer is for use in commercial and residential hydronic heating systems to provide make-up water to the boiler, and prevent backflow when supply pressure falls below system pressure. It consists of a bronze backflow preventer, model 9D and a bronze feed water pressure regulator, model 1156F, in one pre-assembled unit. The high capacity fill valve provides quick system filling and purging. It is designed for use in the boiler feed lines of hydronic heating systems and has 1/2 inch union solder inlet x NPT threaded outlet connections. The maximum pressure is 100 PSI (6.9 BAR).