Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number CA 3172R4 found under Frequency Agile Fil by Netcom Inc. The National Stock Number assigned to this part is 5915015626856, 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 CA 3172R4.