1004538B Hengst Filling and Breathing Filter, Size 0 (R928018808, FEF 0 P10-F00)1004538B Hengst Filling and Breathing Filter, Size 0 (R928018808, FEF 0 P10 F00); 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;