The Shop-Vac® Cartridge Filter is designed to combat your toughest challenge, the filter can be used for dry pick up and small amounts of wet pick up. It fit's Shop-Vac® brand wet dry vacuums 5 U.S. gallon* (18.9 litres*) and above (except 5 U.S. gallon* (18.9 litres*) portable model H87S, 5 U.S. gallon* (18.9 litres*) HangUp®, 5 U.S. gallon* (18.9 litres*) Wall Mount and 6 U.S. gallon* (22.7 litres*) long life model P12S Vacuums). The approximate size of the cartridge is 8 inch (20.3 cm) diameter and 6.5 inch (16.5 cm) high.