specialize in all essential aquarium accessories such as air pumps, air stones, sponge filters, 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. It will stop oxygen supplement and damage your air pump, water lover needs. Made of durable plastic and suitable for most popular aquarium air pumps, it can prevent water suction and ensure smooth air circulation. Indispensable for the most careful ventilation of your aquariums. Only for oxygen systems Fits standard 0.5 cm tubing No airflow restriction Robust and unalterable No air leaks or noise Packaged with 10 pieces in total
