Series N256 Bronze 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 a bronze body construction with NPT threaded inlet and outlet connections, a tight seating check valve, and built-in integral strainer. Series N256 has high capacity performance and simplified servicing design. It is suitable for use in the boiler feed lines of hydronic heating systems. Maximum Pressure: 100psi (6.9 bar).