Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number C400-4-3SS found under Filter Band Pass by Spectrum Fsy Microwave Inc. The National Stock Number assigned to this part is 5915010732420, 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 C400-4-3SS.