Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 17G103511-503 found under Hose Air Duct by Boeing Company The. The National Stock Number assigned to this part is 4720014966272, 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 17G103511-503.