Quantity:1 batteries required:No Batteries Included:No Item Weight:35 g Specification: About this item High Quality MaterialOur water stop valve is made of high quality PP material, durable and long service life. Easy to OperateWhen you using air pump and our check valve could be used to prevent water from entering the machine pump, this anti-ozone valve is very easy to handle. Protecting ValveWhen the oxygen filling pump stops working suddenly, due to the internal and external pressure difference, the water flow will flow backward and damage the oxygen filling pump. Our water stop valve can prevent this situation. Mainly UsageWhen the position of air or water at the other end of the pump is higher than that in front of the pump, our water stop valve can prevent backflow of water Avoid BackflowWhen the air pump is cut off and stopped, there is no danger of water backflow. It is a small protective cover for air pumps. See more product details High Quality MaterialOur water stop valve is made of high quality PP material, durable and long service life. Easy to OperateWhen you using air pump and our check valve could be used to prevent water from entering the machine pump, this anti-ozone valve is very easy to handle. Protecting ValveWhen the oxygen filling pump stops working suddenly, due to the internal and external pressure difference, the water flow will flow backward and damage the oxygen filling pump. Our water stop valve can prevent this situation. Mainly UsageWhen the position of air or water at the other end of the pump is higher than that in front of the pump, our water stop valve can prevent backflow of water Avoid BackflowWhen the air pump is cut off and stopped, there is no danger of water backflow. It is a small protective cover for air pumps.