Mac Allister washable cartridge filter, designed to fit Mac Allister 20L, 30L and 40L capacity vacuum cleaners. Pleated design provides an increased surface area to improve airflow and reduce clogging. Captures fine dust particles from your vacuum cleaner’s airstream, preventing dust from re-entering the room. Easy to install with built in retainer and locking cap. Wash at regular intervals to maintain optimum cleaning performance and ensure it is dried thoroughly before installation. Compatible with Mac Allister 16L wet and dry vacuum cleaner (model MWDV-16L-A), Mac Allister 20L wet & dry vacuum cleaner (model MWDV-20L-A), Mac Allister 30L wet & dry vacuum cleaner (model MWDV-30L-A), Mac Allister 40L wet & dry vacuum cleaner (model MWDV-40L-A).