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Bubbler may refer to:
A small water-display device that bubbles or jets water for decoration or aeration.
An aquarium air-stone/air diffuser type device that produces bubbling to aerate water and improve circulation.
A “bubbler” used in some industrial/chemical systems to monitor or regulate gas/liquid behavior by bubbling gas through a liquid.
“Bubbler” is sometimes used as a nickname in sports contexts for playoff-related trophies or prizes, depending on league/region.