Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number F1L0421-000 found under Filter Band Pass by Cts Reeves Frequency Products. The National Stock Number assigned to this part is 5915001025255, and the Federal Supply Class is 5915 Filters And Networks. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like F1L0421-000.