Coarse dirt/ash filter for cleaning fireplaces, tiled stoves, barbecues, sauna ovens, etc., as well as removing coarse dirt. This drums sits in between the vacuum & the ash you are collecting. The ash & large debris is then collected by the drum. Some fine dust is then likely to be pulled through into the vacuum cleaner. A normal Henry bent tube will push into the top of the interceptor drum, or Karcher recommend the use of a wet & dry Karcher vacuum.