Datesheet of Milvent Vent Valve Actual Picture Performance: ->Block ingress of wide range of contaminants,from rain and insects to dirt,dust,sand and other,particulates, ->Even Open Valve still keep IP 68,IP69K protection class and -40°C to +125°C ->operating temp.range.Best to use under the tough environment. ->Installing on the side face of enclosures is effective for outdoor use. ->Breather plug with aluminum cover and specially-designed internal valve with an inox spring,calibrated from 0.05 to 0.10 bar, which opens at intervals to vent internal pressure created by fluid turbulence and keep out foreign bodies. It is especially recommended for applications on Speed-shift Gears, Agricultural over-Gears and Industrial Speed-Reduction Gearboxes,a low pressure air supply system. Dimensions Typical Open Valve Enviromental performance Other sizes please check with us.We can OEM any sizes for you rapidly within 2weeks. www.milvent.com; [email protected] +86182183691