TM 9-2320-209-20-3-4 c. Repair. FRAME 1 1. Using wrench, unscrew and take out elbow (1). 2. Using wrench, unscrew and take out reducer pipe (2) or elbow (3). 3. Using allen wrench, unscrew and take out pipe plug (4). 4. Check that all parts have no damage or wear. If part is damaged, get a new one. GO TO FRAME 2 23-113