Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 25-2590-4 found under Streamer Warning by The Boeing Company. The National Stock Number assigned to this part is 8345002426712, and the Federal Supply Class is 8345 Flags And Pennants. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 25-2590-4.