【Features】When the oxygen pump stops working, the water in the aquarium may return to the inlet pump, causing damage to the air pump. A check valve can solve this problem .The check valve can prevent the air pump from entering the water and is an essential accessory. 【Good Quality】Our check valve is made of high quality materials, wear-resistant and durable, not easy to corrode and age. The noise of the check valve is very low when it is is used, and it will not affect your normal rest, even at night. 【Qne-way valve】Our check valves are one-way valves that can effectively prevent water backflow. After the installation is completed, the check valve will slightly reduce the air outlet, but this will not affect the normal use of the air pump. 【Small Size】Our check valves are black and compact. Our check valve accepts a trachea with a diameter of 0.4 cm, approximately 0.2 inches. 【Scope of application】Our check valves can be used as air pump accessories for aquariums and aquariums. The
