specializes in all essential aquarium accessories such as air pumps, air stones, filter sponges, fishing nets, cleaning brushes and other accessories to arrange your aquariums. Red one-way check valves Water backflow will always occur when the pump is turned off or the power source is interrupted. This will stop supplemental oxygen and, worst of all, damage your air pump. Check valves are necessities in the water lover’s home. Made of durable plastic and designed to fit most common aquarium air pumps, the valves can effectively prevent water from siphoning off and ensure smooth airflow. For oxygen systems only Fits standard 0.5 cm tubing No airflow restriction Sturdy and aging resistant No air leakage or noise Packed with 6 pieces in total
