SECTION II TM 5-4220-227-24P (1) (2) (3) (4) (5) (6) ITEM SMR PART NO CODE    CAGEC NUMBER DESCRIPTION AND USABLE ON CODES  (UOC) QTY FIG.  50 PRESSURE REGULATOR, 0₂ (CONT) 41 PAHZZ    13669 5200-021237- ...PACKING, PREFORMED PART OF KIT ...................... 1 CLEAN P/N 389-1873-LEVEL-2-CLEAN AND P/N 389-1875-LEVEL-2-CLEAN 42 13669 1577-1-LEVEL-2- ...BUTTON.  ..................................................................... 1 CLEAN 43 PAHZZ    13669 5200-021287- ...PACKING, PREFORMED PART OF KIT ...................... 1 LEVEL-2-CLEAN P/N 389-1873-LEVEL-2-CLEAN AND P/N 389-1875-LEVEL-2-CLEAN 44 13669 1149-1-LEVEL-2- NUT. CLEAN 45 PAHZZ    13669 1022-LEVEL-2- ...SPRING PART OF KIT P/N 389-1875- ......................... 1 CLEAN LEVEL-2-CLEAN 46 13669 1023-2-LEVEL-2- ...VENT, VALVE PART OF KIT P/N 389-1875-................ 1 CLEAN LEVEL-2-CLEAN 47 13669 10364-LEVEL-2- ...SEAT,VALVE PART OF KIT P/ N ................................. 1 CLEAN 389-1873-LEVEL-2-CLEAN AND P/N 389-1875-LEVEL-2-CLEAN 48 13669 1522-2-LEVEL-2- ...RETAINER, SEAT ........................................................ 1 CLEAN PAHZZ    13669 389-1873-LEVEL- ..KIT, SOFT GOODS. 2-CLEAN RING, BACK-UP (1) 50-15 PACKING, PREFORMED (1) 50-16 SEAT, VALVE (1) 50-22 GASKET, ORFICE (1) 50-31 PACKING, PREFORMED (1) 50-39 PACKING, PREFORMED (1) 50-41 PACKING, PREFORMED (1) 50-43 SEAT, VALVE (1) 50-47 PAHZZ    13669 389-1875-LEVEL- ..KIT, REPAIR, STANDARD ...................... 1 2-CLEAN PACKING, PREFORMED (1) 50-14 RING, BACK-UP (1) 50-15 PACKING, PREFORMED (1) 50-16 SPRING, VALVE (1) 50-20 CAP, VALVE (1) 50-21 SEAT, VALVE (1) 50-22 GASKET, ORFICE (1) 50-31 PACKING, PREFORMED (1) 50-39 PACKING, PREFORMED (1) 50-41 PACKING, PREFORMED (1) 50-43 SPRING (1) 50-45 VENT, VALVE (1) 50-46 SEAT, VALVE (1) 50-47 END OF FIGURE 50-3