What is a bubbler, anyway? All water pipes make bubbles - that’s what they are made to do. The qualities that define a bubbler are: a vertical downstem that places the slide directly above the diffuser and a neck/mouthpiece that is attached to the side of the main chamber. Browse our bubblers to find your next best friend! Greenlight Glass, C2 Customs and many other artists on here make excellent bubblers.