Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 991 20023 found under Parts Kit Seal Mecha by Jcb Inc. The National Stock Number assigned to this part is 5330016534749, 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 991 20023.