Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number U540012 found under Outlet Boss by Triumph Thermal Systems Inc. The National Stock Number assigned to this part is 4730013753580, 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 U540012.