TM 9-2320-209-20-3-2 (c) Air tube elbow fitting NOTE The air tube elbow on the right side air tank on truck M764 is used for this typical proce- dure. FRAME 1 1. Using 13/16-inch combination box and open end box wrench, unscrew and take off tube nut (1). 2. Using 3/4-inch combination box and open end box wrench, unscrew and take out elbow fitting (2). END OF TASK 13-154