... ,Germany technology 2)union of filter,regulator,lubricator 3)clean compressed air,keep pressure,add regulated oil *The OU consisted of OFR ... be ordered separately.*The OF with water separator cleans the compressed air of fliud oil,condensation and dirt particles.For special aplication ... bolt.Normally,1 to 12 drop per 1000L of the air is sufficient. Air Preparation Union of filter regulator lubricator