Features: The exhalation effect is good, which is beneficial to the photosynthesis of aquatic plants and helps the growth of aquatic plants.Adopts good and stable nanometer ceramic material, make the CO2 bubbles pass evenly.Invisible mini check valve, more stable performance, easy to avoid returning.Stable structure, easily avoid backflow. With suction cup, help better fixed to the fish tank.Specification:Condition: 100% brand newMaterial: AcrylicColor: as picture shownSize: approx. 8.5cm/3.3inch3.5cm/1.4inchInstructions:1. Connect the refiner and the CO2 decompression gauge with a special trachea, and place it in the center of the fish tank.2. Before connecting the thinner to the trachea, pour water into the thinner elbow. After connecting the trachea, push the water into the thinner cavity by air pressure, so as to realize the bubble recording function.3. Slowly open the fine-tuning switch of the carbon dioxide pressure reducing valve, confirm the amount of carbon dioxide added by the bubbling speed in the refiner cavity, and adjust the flow appropriately according to the size of the fish tank.Package List: 1 x CO2 Diffuser1 x Suction Cup.