4210-12-178-1286 (TK-BA35-4210-222)
4210-12-178-1286 is equivalent to manufacture part number 20-139. It is a fire warning element 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.