This thick foam filter is designed to be used in most wet/dry utility vacuums. It is a sleeve measuring 6 1/2" high and about 4 1/2" in diameter made of 1/2" thick foam rubber. Generally, this foam filter is used instead of a fanfold cartridge filter for wet pickup although it is sometimes used for dry pickup when covered with a paper or reusable fabric filter. This is the standard filter size used in most wet/dry utility vacuums, including those made by Shop-Vac Corporation. For similar products see our list of Generic Wet/Dry Vacuum Supplies.