Ash Catchers add a functional water chamber onto your pipe between your Joint & Slide. An Ash Catcher adds filtration to your setup will trapping the ashes pulled through your bowl.
Dry Catchers also sit between your Joint and Slide, and may still hold water, but are designed to filter ash without adding extra function to your setup. If you like how your Waterpipe already hits but want to clean it less often, a Dry Catcher is the perfect solution!