TM 9-2320-209-20-3-4 c. Replacement. FRAME 1 1. Put pressurization valve hand control assembly (1) through hole in instrument panel (2), washer (3), nut (4), and grommet (5). 2. Using wrench, screw on and tighten nut (4). 3. Push knob (6) all the way in. GO TO FRAME 2 23-118