The Interpump S284 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. 50-280 Bar pressure. 7-41 Lpm flow. 85°C max water temperature. Brass construction. Not preset, see manual. 3/8" male inlet. 10mm hose barb discharge.