Tetra® Whisper® Air Pumps for aquariums provide powerful, dependable airflow. Efficient and easy-to-use, Whisper Air Pumps are available in a range of sizes to handle the aeration needs of aquariums from 10 to 100 gallons. Tetra Whisper 40 Air Pump (non-UL) can be used in tanks 20 to 40 gallons. The Tetra Whisper Air Pump’s patented dome shape and sound-dampening chambers minimize turbulence and produce a smooth, quiet stream of air. Its wide footprint, rubber feet and suspended pump motor eliminate sound-producing vibrations. Thick walls insulate motor noise, and powerful diaphragms provide ample airflow for deep water applications. Uses standard-size aquarium tubing. Select the proper size air pump for your tank. Since 1951, Tetra has developed the world’s most comprehensive body of fish food knowledge, and fishkeeping enthusiasts have looked to the brand for products and solutions that add ease and beauty to their home. Whether you're an experienced hobbyist or just starting out, Tetra has everything you need – from a large variety of quality fish food and innovative equipment to test kits and decor. POWERFUL: Tetra® Whisper® Air Pump provides dependable airflow to your aquarium. QUIET: Patented dome shape, suspended motor and sound-dampening chambers for quiet operation. PROVIDES OXYGEN AND WATER MOVEMENT: Keeps underwater pets happy. AVAILABLE SIZES: Select the proper size for your tank – 10, 20 and 40-gallon pumps have single air outlets, 60 and 100-gallon pumps feature dual outlets. NON-UL LISTED: Reliable performance at an economical cost.