Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number C5579-21C found under Gasket by Walworth Co. The National Stock Number assigned to this part is 5330007685004, 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 C5579-21C.