Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number AS21911W8 found under Tee Tube To Boss by Ace Aviation Service Inc. The National Stock Number assigned to this part is 4730006405112, and the Federal Supply Class is 4730 Hose Pipe Tube Lubrication And Railing Fittings. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like AS21911W8.