Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 02161-2059 found under Tube Radiator by Leidos Inc. The National Stock Number assigned to this part is 2930009055890, and the Federal Supply Class is 2930 Engine Cooling System Components Nonaircraft. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 02161-2059.