Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number P99-56 PIECE 16 found under Gasket by Elsag Bailey Inc. The National Stock Number assigned to this part is 5330010388588, 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 P99-56 PIECE 16.