Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 81-202 found under Filter Element Fluid by Nelson Industries Inc. The National Stock Number assigned to this part is 2590000699257, 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 81-202.