TM 9-2320-209-20-3-2 b. Removal. WARNING Make sure air compressor has cooled off before working on it. Air compressor gets very hot and may cause serious burns. FRAME 1 1. Using 7/8-inch open end box wrench, unscrew and take off tube nut (1). 2. Using 9/16-inch open end box wrench, unscrew and take off tube nut (2). GO TO FRAME 2 13-238