Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 305474-1057 PIECE 66 found under Packing Ring by Diamond Power International Inc. The National Stock Number assigned to this part is 5330011097936, 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 305474-1057 PIECE 66.