Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 20-120 found under Packing Preformed by Marysville Marine Distributors Inc. The National Stock Number assigned to this part is 5330007335550, 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 20-120.