The BOSCH VF320H HEPA filter is made for the gas18v-3 18V 2. Gallon wet/dry vacuum cleaner, capturing 99. 97% of particles 0. 3 microns and larger. It is designed to work with the vacuum rotational airflow technology, which produces sustained suction for superior performance due to a special rotation structure within the vacuum cleaner. The filter is washable, for extended use. The filter is easy to replace; just twist in and lock. It can be used with wet-vacuuming applications as well as dry.