Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 3-03521S04 found under Flange Exhaust Pipe by Eaton Corporation. The National Stock Number assigned to this part is 1560013374088, and the Federal Supply Class is 1560 Airframe Structural Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 3-03521S04.