Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number NC1-1X found under Hose Air Duct by W B Arnold Company Inc. The National Stock Number assigned to this part is 4720004036410, 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 NC1-1X.