Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 5550166 ITEM 4 found under Gasket by City Entertainment Corporation. The National Stock Number assigned to this part is 5330012195992, 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 5550166 ITEM 4.