Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 157269R91 found under Seal Plain Encased by Ace Aviation Service Inc. The National Stock Number assigned to this part is 5330005519334, 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 157269R91.