Used with lancer half masks; niosh tc-19c-309
No other part numbers with same form, fit, and function found.
NSN 5895-00-443-8821
NSN 6620-00-578-5851
NSN 5920-01-282-8927
NSN 5998-01-145-5199
NSN 5999-01-053-6664
NSN 6620-00-526-4296
NSN 5990-01-642-0113
NSN 6145-00-984-4139
NSN 6620-01-545-4845
NSN 5975-01-495-1343
NSN 5998-00-764-1405
NSN 5998-00-421-3102