1014670B Hengst Filling and Breathing Filter, Size 1 (R928052088, FEF1-2X/H3V3-M-K-ES100)1014670B Hengst Filling and Breathing Filter, Size 1 (R928052088, FEF1 2X H3V3 M K ES100); FEF Breathing Filters are used in hydraulic systems for filtration of the suction air of the fluid tank. They are designed for installation on the fluid tank. They consist of a cap with bayonet lock including filter element and base wtih filling strainer. Features: Special highly efficient filter materials; Air filtration in hydraulic and lubricating oil tanks;