Sole source required by statute 6.302
The portion of a mask, air line; mask, chemical-biological; mask, gas; or other breathing equipment mask that partially or completely encloses the user's face.
NSN 5985-00-100-9029
NSN 5945-00-815-9097
NSN 6685-00-473-9574
NSN 5960-00-153-7115
NSN 4140-01-304-5477
NSN 6620-01-583-2779
NSN 5925-01-132-9120
NSN 5985-01-582-1927
NSN 5960-01-325-1581
NSN 6220-01-224-8746
NSN 5950-01-532-5458
NSN 5910-00-422-4250