Series 1156F High Capacity Feed Water Pressure Regulators are for use in commercial and residential hydronic heating systems to fill the boiler and piping system with water, and to maintain water pressure in the system at all times. It also provides make-up water to the system in the event of system leaks. It consists of an iron and bronze body construction with NPT threaded inlet and outlet connections, a tight seating check valve, purge lever for manual purging, and a stainless steel strainer. Series 1156F has high capacity performance and simplified servicing design. It is suitable for use in the boiler feed lines of hydronic heating systems. Also available with union solder or union threaded connections. Maximum Pressure: 100psi (6.9 bar).