Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 646790 found under Tube Assembly Metal by E A Patten Co The. The National Stock Number assigned to this part is 4710008729563, and the Federal Supply Class is 4710 Pipe Tube And Rigid Tubing. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 646790.