Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number A128-14-9 found under Tube Fle Ible Sypho by Knapp Monarch Co. The National Stock Number assigned to this part is 4710000784379, and the Federal Supply Class is 4710 Pipe Tube And Rigid Tubing. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like A128-14-9.