Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number AS21912W4 found under Tee Tube by Society Of Automotive Engineers Inc. The National Stock Number assigned to this part is 4730011061254, 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 AS21912W4.