TM 9-2320-209-20-3-3 b. Replacement. FRAME 1 1. Using spanner wrench, unscrew and take hose (1) off reducer coupling (2). 2. Using spanner wrench, unscrew and take off reducer coupling (2). 3. Using spanner wrench, screw on and tighten dust cover (3) to delivery valve (4). 4. Put reducer coupling (2) and dispenser hose (1) into rear compartment (5). 5. Close rear compartment doors (6). END OF TASK 18-338