Used as a reusable exhalation port
NSN 5990-01-162-9220
NSN 5960-00-581-9719
NSN 6645-01-528-4621
NSN 6320-01-652-3806
NSN 5905-01-437-4000
NSN 6620-00-999-2425
NSN 6145-01-471-6362
NSN 6220-01-092-8959
NSN 5910-01-585-1178
NSN 5910-00-713-4192
NSN 5910-01-291-0486
NSN 5895-01-508-4808