AC series Air treatment units ------- AFC, BFC FR.L air treatment units are same style as AIRTAC. It includes 2 parts: filter®ulator and lubricator. But still have 3 function: filtration, decompression and lubricating. FR.L is much compact then F.R.L. We manufacture all important parts by ourself to insure the quality. Outsourcing parts were selected and tested very strictly. Auto Drain can be selected.