Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number X1601 found under Cup Grease by Prestolite Electric Inc. The National Stock Number assigned to this part is 4730007520439, 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 X1601.