4240-00-200-0765 (MILM14329BASIC0NLY)
4240-00-200-0765 is equivalent to manufacture part number B5-1-266. It is a chemical-biological mask and is classified under Federal Supply Class 4240 (4240 - Safety and Rescue Equipment), stocked for defense, aerospace, MRO, and industrial maintenance applications. This item is cataloged in the NATO supply system under 4240 - Safety and Rescue Equipment and is available through NSN-PARTS for U.S. government MRO, and commercial procurement.