【Quality material】 This air pump check valve is made of high quality, durable and robust plastic, can effectively prevent the water from entering the air pump. 【Management control】 It can prevent the aquarium from reflving the water, which is caused by the decrease, and maintain the function and life of the carbon dioxide bottle. 【Prevent discharge】 When used in the ozone generator, it can prevent ozone from reflving to the air pump and eroding the propeller. 【Other application】 pump export with check valve, it turns off immediately to avoid the risk of water reflux when the air pump is turned off and stops working. 【Air pump accessory 】 Fits 4 mm diameter tubes and can be used with aquarium oxygen pumps. Specification: Condition: 100% brand new Element type: Check valve Material: plastic Product color: Blue Suitable for: Tube Manometer input / output 4mm / 0.2in Function: Used as a pump of oxygenation due to the pressure difference between the inside and the outside when the work
