Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 604S found under Gasket by Ruthman Pump And Engineering Inc. The National Stock Number assigned to this part is 5330005002984, 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 604S.