Genuine Caleffi ProductThis is an inlet control valve for use on an unvented hot water cylinder system. It incorporates pressure reducing valve, pressure relief valves, check valve, and filter in a single valve design.Caleffi Part Number: 533112CSTMultibloc control valve for unvented hot water cylindersContains circlip fit pressure reducing valve and relief valvePressure reducing setting: 3.0 barPressure relief setting: 6.0 bar22mm copper x copper connectionMaximum working pressure: 65°CMaximum inlet pressure: 12 bar