Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number BF1997 found under Hose Air Duct by Bae Systems Land And Armaments L P. The National Stock Number assigned to this part is 4720009161885, 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 BF1997.