This suction cup squeezes out ALL KINDS of air, including the very small bubbles we need! For people who complain about "not enough bladders," it's simple - your pump is either old or not powerful enough. This baby is 4 inches wide. It takes some strength to walk. I hooked mine up to a 60 gallon Tetra Whisper air pump. Went like clockwork. Now the air just flows out of this thing! Tetra Whisper Air Pump, 60 to 100 Gallon Aquariums
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