Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number A517-22 found under Disk Garbage Dispos by Hewitt Robins Div Litton Systems Inc. The National Stock Number assigned to this part is 4540003006719, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like A517-22.