Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number ASTMF439 found under Tee Pipe by American Society For Testing And. The National Stock Number assigned to this part is 4730000523429, 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 ASTMF439.