Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number U2-04-0028 found under Joy Stick Seal by Marco Ophthalmic Inc. The National Stock Number assigned to this part is 5330014733765, and the Federal Supply Class is 5330 Packing And Gasket Materials. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like U2-04-0028.