A bubbler pipe is smaller than a bong and uses water to filter smoke and vapor. Most bubblers have no removable components, though some may have detachable bowls. Most bubblers fit into two categories: hammer bubblers and upright bubblers. Hammer bubblers feature a bubbler chamber connected at a 90° angle to a mouthpiece. Typically either glass feet or a flat base helps the hammer stand up between uses. Upright bubblers feature a bubbler chamber with a single, broad glass base and a mouthpiece that extends from the side of the chamber at a 45° angle, kind of like a to-go cup.