The Marina 100 Air Pump combines high performance output with quiet operation. It is a reliable source of air for increasing water movement and turbulence for proper oxygenation, and can also be used to operate items such as air stones, air curtains and air-actuated ornaments. The Marina 100 Air Pump has a single outlet, soft rubber feet which suppress vibration and it is ideal for aquariums 20 to 40 US gallons.