SECTION II TM 5-4220-225-24P FIG. 16 HELMET LINER, DUCTS, SHELL AND AIR SUPPLY LINES (CONT) AIR SUPPLY VALVE STEM (3)     10-9 PACKING, PREFORMED (9) 10-10 RELIEF VALVE (3) 10-11 BAFFLE TUBE ASSY (1)     11-2 PACKING, PREFORMED (14)     11-3 CAP, BAFFLE TUBE (1)     11-4 AIR SUPPLY DIFFUSER (9)     11-5 ELEMENT, FILTER (120)     11-6 EAR CLEARING PAD ASSY (12)     11-7 SCREW-CAP, SCH-HEX (6)     12-1 SCREW-CAP, SCH-HEX (6)     12-3 WASHER, LOCK-SPRING, HELICAL (12)     12-2 COVER ASSEMBLY, ADJUSTABLE EXHAUST VALVE (1)     12-5 SETSCREW, HEX (3)     12-6 FRICTION DRAG INSERT (9) 12-12 EXHAUST VALVE DIFFUSER (9) 12-14 VALVE SPRING (9) 12-15 POPPET VALVE ASSY (1) 12-16 CHIN BUTTON (3) 12-17 PACKING, PREFORMED (18) 12-21 RETAINER, VALVE (3) 12-22 DIAPHRAGM, VALVE (1) 12-23 PACKING, PREFORMED (1) 12-25 AMBIENT EXHAUST VALVE COVER (1)     13-5 EXHAUST VALVE DIFFUSER ( )     13-6 CAP, AMBIENT VALVE (3)     13-7 DIAPHRAGM, EXHAUST VALVE (1)     13-8 PACKING, PREFORMED (1) 13-10 PIN, SAFETY (1)     14-1 SPRING, LOCKING, LEFT (2)     14-2 UPPER LUG ASSY, RIGHT (2)     14-3 SCREW-CAP, SCH-HEX (12)     14-4 LUG, HELMET (2)     14-5 PACKING, PREFORMED (1)     15-2 WHIP, COMMUNICATION W3 (1)     15-3 PACKING, PREFORMED (24)     15-4 MICROPHONE (6)     15-5 CABLE ASSY, W1, MICROPHONE (3)     15-6 (1) ITEM NO. (2) SMR CODE (3) CAGEC (4) PART NO. (5) DESCRIPTION AND USABLE ON CODES (UOC) (6) QTY 16-3