The Interpump SR safety relief valve is a manually-adjustable, pressure- operated device which, according to its setting, releases the excess of water when the pressure inside the pump/system exceeds the adjusted value, thus reducing the pressure. The normal working conditions can be restored by turning off and then restarting the system. 30-200 Bar pressure. 6-41 Lpm flow. 60°C max water temperature. Brass body - St.steel internals. Not preset, see manual. 3/8"BSPM inlet. 1/4"BSPF outlet.