Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 431340B found under Parts Kitseal Replacementmecha by Lake Shore Systems Inc. The National Stock Number assigned to this part is 5330016793411, 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 431340B.