Watts - This 1/2" combination fill valve and backflow preventer are used in commercial and residential hydronic heating systems to provide make-up water to the boiler, prevent backflow when supply pressure falls below system pressure and designed for use in the boiler feed lines of hydronic heating systems. This pre-assembled unit consists of a 1/2" brass backflow preventer with union solder x NPT end connections, model 9DS and a bronze feed water pressure regulator, mode 1156F. It has a high capacity fill valve that provides quick system filling and purging. The maximum working pressure rating is 100 PSI (6.9 BAR) at 212°F (100°C).
Warning: this product contains a chemical known to the State of California to cause cancer. P65Warnings.ca.gov