Aqueon QuietFlow Air PumpAqueon QuietFlow Air Pumps provide powerful air flow with advanced features to virtually eliminate operating noise. Unlike other air pumps, QuietFlow models feature vertical hose outlets and check valves to prevent airline kinking, with a rubber base to absorb vibrations. Virtually silent operation and contemporary upright design Vertical hose outlet to help avoid kinking in airline tube Rubber base absorbs vibration for less noise An internal check