Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 40-E-687 found under Rubber Sheet Cellular by West American Rubber Co. The National Stock Number assigned to this part is 9320014775392, and the Federal Supply Class is 9320 Rubber Fabricated Materials. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 40-E-687.