Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number F18003 found under Packing With Retainer by General Steel Tank Co. The National Stock Number assigned to this part is 5330008146675, 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 F18003.