Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4B380-300 35-X found under Filter Band Pass by K And L Microwave Inc. The National Stock Number assigned to this part is 5915010757233, 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 4B380-300 35-X.