The Interpump SX1 pressure regulator valve is a manually-adjustable, pressure-operated device which, according to its setting, limits the pump/system pressure by conveying the excess of water to the by-pass.Moreover, when the outlet flow is blocked, this device totally releases the flow, thus keeping the pump/system at the adjusted pressure. 250 Bar max pressure. 60 Lpm max flow. 85°C max water temperature. AISI 316L stainless steel. Not preset. 1/2"BSPF inlet. 1/2"BSPF bypass port.