Used with lancer half masks; niosh tc-19c-309
No other part numbers with same form, fit, and function found.
NSN 5925-01-502-6475
NSN 5910-01-021-2720
NSN 5999-00-584-2006
NSN 6105-01-147-6576
NSN 6645-01-165-3785
NSN 5960-01-032-4229
NSN 5998-00-420-2477
NSN 6220-00-200-7888
NSN 5905-01-628-0111
NSN 6610-01-147-3099
NSN 5990-00-889-9634
NSN 5960-00-406-9985