Air preparation-OF 1,filter element:40 um /5 um (PE or brass) 2,drain:manually,semi-auto,full auto,auto The OF with water separator cleans the compressed air of fluid oil,condensation and dirt particles,for special application,the standard 40μm filter element may easily be replaced by a 5μm filter element. Air preparation -OF(filter) :Specifications: SizeMINIMIDIMAXIMediumCompressed airFeatures ...