Series T145B Bronze Dual Controls (Regulator and Relief Valve) with Strainer 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, an attached bronze body diaphragm relief valve, a tight seating check valve, purge lever for manual purging, and a bronze strainer. Series T145B 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).