Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number D18 2121 found under Elbow Tube by Eaton Corporation. The National Stock Number assigned to this part is 4730661511371, 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 D18 2121.