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 6650-01-055-3527
NSN 5996-00-846-3300
NSN 5855-00-869-3635
NSN 6145-01-346-3931
NSN 4140-01-258-0071
NSN 5960-00-883-0971
NSN 6220-01-121-4499
NSN 5990-00-389-0554
NSN 6145-01-263-7322
NSN 5950-00-230-0414
NSN 5950-01-579-4485
NSN 7035-01-048-2813