TM 10-3930-659-20 7-16. TRANSMISSION OIL COOLER BACKFLUSH (Con't). 2. Remove hose (6) and preformed packing (7) from elbow (8).  Discard preformed packing. 3. Remove hose (5) and preformed packing (10) from tee(9).  Discard preformed packing. 4. Install preformed packing (12) and plug (11) on tee (9). 5. Install preformed packing (14) and plug (13) on elbow (8). 6. Install two preformed packings (15), adapter (16), and hose (5) on hose (6). TA707355 7-51