Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 2-03-1-4004 found under Oil Cooler Test Stand by Uni Systems Inc. The National Stock Number assigned to this part is 4920004670759, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 2-03-1-4004.