specialize in all essential aquarium accessories such as air pumps, air stones, filter sponges, fishing nets, cleaning brushes and other accessories to design your aquarium. Red Check Valves Water backflow occurs whenever the pump is turned off or the power source is interrupted. This shuts off extra oxygen and, worst of all, damages your air pump. Check valves are necessities in the water lover’s home. The valves are made of durable plastic and are designed for most common aquarium air pumps. They can effectively prevent water from being sucked in and ensure smooth air circulation. Oxygen systems only Fits standard 0.5 cm tubing No airflow restrictions < li>Sturdy and durable < li>No air leaks or noise Packaged with 6 pieces in total
