Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number GSC-21-99607-027 found under Seal Nonmetallic Strip by W L Gore And Associates Inc. The National Stock Number assigned to this part is 5330016698257, 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 GSC-21-99607-027.