Silence is golden with the JW® Aquarium Fusion 600 Air Pump. JW Fusion Air Pumps feature a patented baffle system with a series of chambers interlinked by small openings that absorb sound, making the Fusion Air Pump amazingly quiet. It also creates pressure as the air is pushed through each small opening. The has an easy-to-turn air control knob allows you to adjust for precise air flow control. Flexible, rubber feet absorb vibrations to further reduce noise. Designed to promote proper gas exchange and provide a healthy environment for your fish and aquatic plants to thrive in.