Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number FT1398-12C21 found under Hose Air Duct by Automation Industries Inc. The National Stock Number assigned to this part is 4720006145891, 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 FT1398-12C21.