Use the shop vacreg foam sleeve for picking up wet messes when used alone the foam sleeve is also required when using reusable dry filters the approximate size of the foam sleeve is 8 inch diameter and 65 inch highthe foam sleeve is required unless you are using a cartridge filter it fits shop vacreg brand wet dry vacuums 5 gallon and above except 5 gallon portable model h87s 5 gallon hangupreg 5 gallon wall mount and 6 gallon long life model p12s vacuums