AA, AB series air treatment AA, AB series air treatmentAA, AB series air treatment, widely used in pneumatic air system. * 3 units air combination (F+R+L): AAC, ABC series * 2 units air combination (F. R+L): AAFC, ABFC series * Air filter / regulator (F. R): UFR series * Air filter: UF series* Air regulator: UR series* Air lubricator: UL series AA, AB Series F. R. L.