TM 9-2320-209-20-3-2 b. Removal. (1) Air lines and clamps. NOTE The air valve supply line at left rear of chassis on truck M275A2 is used for this typical procedure. FRAME 1 1. Using 7/8-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, hold tee fitting (2). 3. Using 13/16-inch combination box and open end box wrench, unscrew and take off tube nut (3). GO TO FRAME 2 13-150