Abs plastic, threaded on one end; used to cap off the facepiece when using the papr system
NSN 5920-01-571-6624
NSN 5855-01-222-0992
NSN 6110-00-288-4179
NSN 5905-00-376-5220
NSN 7035-01-038-9970
NSN 6150-00-911-9055
NSN 6110-01-139-6930
NSN 5910-00-513-7364
NSN 5999-01-466-8310
NSN 6650-01-606-9209
NSN 5910-01-463-7258
NSN 4140-01-173-7867