auto filter paper for screw air compressor American HV filter and German technology using time 2000 hour welcome OEM order high quality air filter for screw air compressorimport HV filter paper and glue, top quality stainless steel, Function and Features1, flow rate: 0.5-100cbm/min2, dust-proof accuracy: 3µm-12µm3, big filtration area, small resistance4, service life at normal working condition: ...