Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 121-039-0002 found under Network Phase Chang by Merrimac Industries Inc. The National Stock Number assigned to this part is 5915012027272, 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 121-039-0002.