Used as a reusable exhalation port
NSN 6685-01-105-6841
NSN 5999-01-640-7656
NSN 5930-01-329-9512
NSN 2925-01-577-0004
NSN 6320-01-652-3806
NSN 5965-01-222-0166
NSN 5960-00-284-8929
NSN 5910-01-332-7991
NSN 6135-01-173-6306
NSN 2925-01-269-1312
NSN 6610-00-681-0590
NSN 6685-01-372-7852