4210-01-058-2164 (FFG-1-449-FF-1040-451)
4210-01-058-2164 is equivalent to manufacture part number 4120. It is a blow-off cap and is classified under Federal Supply Class 4210 (4210 - Fire Fighting Equipment), stocked for defense, aerospace, MRO, and industrial maintenance applications. This item is cataloged in the NATO supply system under 4210 - Fire Fighting Equipment and is available through NSN-PARTS for U.S. government MRO, and commercial procurement.