Series B911, B911S Bronze Combination Fill Valve and Backflow Preventers is designed for use on the boiler feed lines of 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 pre-assembled backflow preventer (Watts Model 9D) and a bronze feed water pressure regulator (Watts Model 1156F). This combination high capacity valve provides quick system filling and purging and is easily accessible for servicing.

Features

• Pre-assembled for ease of installation
• Series B911 has union NPT x NPT connections
• Purge lever for manual purging
• Series B911S has union solder x NPT connections