Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number AAM1021-0004 found under Hose Air Duct by Flexfab Llc. The National Stock Number assigned to this part is 4720016611507, and the Federal Supply Class is 4720 Hose And Flexible Tubing. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like AAM1021-0004.