Parker Legris Non-return Valves - Uni-directional Female x Female, BSP Legris stainless steel non-return valves allow fluids to pass in one direction whilst blocking flow in the other direction. Robust and extremely compact, they are suitable for use as a safety item in all fluids circuits. They are ideal for use in severe conditions and in aggressive environments. Operation: A stainless steel valve blocks the fluid passage, when the pressure differential is lower than 0.25 bar. Available in 3 sizes to choose from: 1/4" BSP Parallel Female - 458-6788 3/8" BSP Parallel Female - 458-6794 1/2" BSP Parallel Female - 458-6801 Features and Benefits: Permits flow in one direction only Body and shut-off valve in stainless steel 316L Spring in stainless steel 302 ’O’-rings fluorelastomer FKM (FPM) Maximum working pressure 40 bar Temperature range -20°C to +180°C