Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number D21 1608 found under Bush Reducing by Eaton Corporation. The National Stock Number assigned to this part is 4730661511713, 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 D21 1608.