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 6110-01-452-4177
NSN 5930-00-104-3049
NSN 5905-00-721-4378
NSN 5999-00-099-6889
NSN 5910-01-231-3853
NSN 5835-00-876-4544
NSN 2925-01-642-3255
NSN 4140-00-959-4255
NSN 5920-01-370-2731
NSN 5935-00-828-4042
NSN 5975-01-321-9819
NSN 6620-01-633-8443