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