Aquarium Air Flow Control Valve One Way Non-Return Stop Valve

• CONNECT WITH 4MM PIPE: which allow a good amount of air through and prevent aquarium water back filling your air pump, compatible with standard aquarium air pipe of 4mm inner diameter.
• APPLICATION: This check value can be used to prevent water backflow from damaging front-end air pumps or other product equipment. Perfect for aquarium, fishing tackle shop, etc.
• FUNCTION: Greatly protect the oxygenation pump from damaging by water retrograde into pump. One way check valve is placed in your airline tubing between your air pump and aquarium water to prevent water returning down the air line.
• AIR PUMP ACCESSORIES: Non return air pump safety valve, an essential accessories of pump. Complete standard set of aquarium accessories for most air pump brands.