Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 1223 found under Gasket Set by Dresser Rand Co. The National Stock Number assigned to this part is 5330004075621, 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 1223.