Description: 【Material】: The aquarium CO2 valve is made of quality aluminium alloy materials, very sturdy and long time for use 【High Performance】: This 1 way check valve is anti leak and non backflow. Aquarium water valve is designed to anti-backflow non-return in aquarium system, improve the service life of your carbon dioxides bottle 【For CO2 Equipment】: The CO2 line tubing regulator is suitable for Aquarium CO2 system aquarium CO2 diffuser. Suitable for the tube of hole diameter 6mm/0.24inch 【Easy To Use】: Our aquarium CO2 diffuser regulator is light in weight and compact in size, exquisites and small, smooth and flat surface, easy to clean 【Package】: 1 Air Pump Check Valves only, other accessories is not included in the package. This CO2 bubble counter check valve is a great gift for family and friends who loves fishes breeding Specification: Material: Aluminium Alloy Size Chart: Height: 4.6cm/1.81inch Hole: 0.6cm/0.24inch Package Includes: 1x Aquarium CO2 Water Stop Check Valve Note: 1. Please allow slightly error due to manual measurement. 2. Due to the difference between different monitors, the picture may not reflect the actual color of the item. 3. you a wonderful online shopping!