WORKSHOP Wet Dry Vacs WS14045F Wet Application Foam Filter for Wet Dry Shop Vacuum, 3 to 4.5-Gallon Qwik-Lock Filter Fastening System makes removing and installing wet dry vacuum filters quick, easy and secure. Foam filter for wet dry vacuum cleaner is designed for high volume liquid pick-up This wet vac filter has a foam outer layer with structural resin core that provides longer lasting performance Foam filters for wet dry vacuum cleaners are often sleeves, but this cartridge design provides durability for high volume water pick-up Wet vac filters are not designed for collecting dry debris