This quiet, energy-efficient Active Aqua® O2 Pump pushes 240 gallons per hour to provide reliable output for air diffusion devices. Airflow to its four outlets is easily adjustable using the knob on top. The 120-volt, 6-watt O2 Pump features durable construction and a one-year warranty. The air outlets are compatible with 3/16-inch-ID tubing (available separately).