Simple operation, endless DIY pleasure, Perfect carbon dioxide generator 1 x manometer; 2 x bottle cap; 1 x control valve; TUBE Autoprotection design: prevents water from refluing in the magnet and cylinder. The aquarium hose with discharge function prevents discharge when the pressure changes, which can damage the surface of the aquatic plant and the cO2 bottle. Intelligent meter: Used for the CO2 controller. By connecting the water meter, the volume of carbon dioxide can be calculated to provide sufficient carbon dioxide to plants. It also has an anti-return valve function to prevent the liquid from refluing when the pressure changes. Easy to install and use: An excellent choice to make your aquarium unique. Simply produce and costly CO2 permanently with a chemical reaction, and only need to adjust the airflow according to the volume of the CO2 valve. instruction: The standard version is a fast-screw white bottle cap, and the quick insertion version is a white double-ear small ear
