Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number E2.1K found under Filter Element Fluid by Hengst Walter Ing Gmbh And Co. The National Stock Number assigned to this part is 2910121721416, and the Federal Supply Class is 2910 Engine Fuel System Components Nonaircraft. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like E2.1K.