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 5950-00-492-2170
NSN 6320-01-399-6177
NSN 6240-01-305-0908
NSN 5935-00-816-9923
NSN 5835-01-274-1035
NSN 6645-00-218-5015
NSN 6685-01-575-0250
NSN 6650-00-272-2271
NSN 6220-01-212-9016
NSN 6620-00-461-4934
NSN 5999-00-313-0712
NSN 5835-00-257-2852