Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 10 00 1220 PIECE 12 1 1 2 IN found under Retainer Packing by Electric Boat Corporation. The National Stock Number assigned to this part is 5330011285198, 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 10 00 1220 PIECE 12 1 1 2 IN.