TM 9-2320-209-20-3-3 FRAME 7 1. Put end of tube (1) in place and start coupling nut (2) into fitting (3). Put other end of tube (1) in place and start coupling nut (4) into elbow (5). 2. Using wrench, screw on and tighten coupling nut (4). 3. Using wrench, screw on and tighten coupling nut (2). GO TO FRAME 8 18-213