Sell One Way Check Valve Co2 Aquarium Fish Tank Air Pump 4Mm best price

Description: Brand new with high quality. Put in the airline tube between air pump and aquarium water to prevent water from returning down the air line. An essential accessory for every air pump and a good protection during a power or pump failure. Look no further, buy instantly. Features: Suitable for anti-backflow of above 99% air pump and widely applied for oxygen tubes with interior diameter of 4 mm. 1 x Check valve.