Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4D3-0100-0300 found under Hose Air Duct by Flexco Inc. The National Stock Number assigned to this part is 4720005550763, 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 4D3-0100-0300.