This Professional HERCULES™ replacement HEPA filter protects your vacuum motor while filtering out everyday dirt, dust, and debris found in shops or garages. The filter traps 99.97% of dust at 1 micron. The filter is pleated to provide greater surface area and can be cleaned easily using a spray hose and water. Designed to fit HERCULES™ 2 gallon, BAUER™ 3-1/2 gallon, and select wet/dry vacuum brands.