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 5960-00-736-8568
NSN 5895-01-466-8701
NSN 6240-01-391-0399
NSN 6645-01-661-0428
NSN 5945-00-683-8334
NSN 5945-00-240-7869
NSN 6135-01-441-0402
NSN 6220-01-434-1101
NSN 6610-00-466-3104
NSN 6220-00-554-5937
NSN 6645-01-247-4549
NSN 5915-01-555-0034