EnviroCare EVC924 is an aftermarket HEPA filter compatible with Hoover Foldaway upright vacuums, including the Turbo Power 3100, Fold Away Widepath (U5172-900, U5175-900), U5161-900, U5162-900, U5163-900, U5163-940, U5164-900, U5171-900, U5173-900, U5174-900, U5177-900, and the TurboPOWER U5167-900. This is not an OEM Hoover part; it is an EnviroCare aftermarket compatible replacement for OEM part numbers 40130050, 43615-090, and 43615090. HEPA-grade filtration captures fine particles down to 0.3 microns.