QuietFlow Air Pump - 40 The Aqueon QuietFlow Air Pump is designed to provide reliable, near-silent performance for a wide range of freshwater and marine applications. Housed in a sleek, upright outer shell, the QuietFlow's Model 40 is recommended for aquariums under 40 gallons, drawing a mere 2.8 watts. Flexible rubber stabilizers keep the pump in place, while effectively absorbing vibrations to ensure quiet operation. With a vertical hose outlet and internal check valve, this easy-to-use air pump is capable of powering a variety of aeration accessories accepting standard airline tubing. 2.5" x 4.25" x 5.5"