TM 10-3930-669-34 15-3. STACK VALVE REPLACEMENT/REPAIR (CONT). (13)  Install  preformed  packing  (56),  elbow (32),  and  45°  elbow  (15)  on  90°  tee (54). (14) Install preformed packing (55) and 90° tee (54) in stack valve (27). (15) Install   preformed   packing   (53),   45° elbow (30), and 45' elbow (13) on tee (51). (16) Install preformed packing (52) and tee (51). (17) Install  three  preformed  packings  (50) and plugs (49). (18) Install   preformed   packing   (48)   and elbow (24) in stack valve (27). (19) Install   preformed   packing   (47)   and fitting (22). (20) Install   preformed   packing   (46)   and fitting (23). (21) Install   preformed   packing   (45)   and fitting (19). 15-24