Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 021-0800-0001 found under Hose Air Duct by Flexible Technologies Inc. The National Stock Number assigned to this part is 4720011697654, 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 021-0800-0001.