Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 178030-121PC318 found under Gasket by Otis Elevator Co. The National Stock Number assigned to this part is 5330002518423, 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 178030-121PC318.