Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 81337 found under Cap Filler Opening by M B Companies Inc. The National Stock Number assigned to this part is 2590012842124, and the Federal Supply Class is 2590 Miscellaneous Vehicular Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 81337.