... )union of filter,regulator,lubricator 3)clean compressed air,keep pressure,add regulated oil *The OU consisted of OFR and OL,each unit can ... cleans the compressed air of fliud oil,condensation and dirt particles.For special aplication,the standard 40μm filter element may easily ... bolt.Normally,1 to 12 drop per 1000L of the air is sufficient. Air Preparation Union of filter regulator lubricator