Description: 【Fine】Features an optimized, replaceable ceramic disc and double seal air outlet design to consistently produce fine, even CO2 bubbles, maximizing CO2 dissolution for enhanced plant photosynthesis and improved water quality 【Material】Crafted from quality PC material that resists cracking, fading, and deformation, this CO2 diffuser clear construction ensures unobstructed visibility at all times 【Optimal Growth】Effectively boosts the growth of aquatic plants by providing a steady supply of dissolved CO2, helping to maintain a balanced ecosystem in your aquarium 【Backflow Avoidance】Equipped with a built in check valve to prevent siphon backflow, protecting your CO2 equipment from potential damage and ensuring the safety of both aquatic pets and plants 【Easy Maintenance】The replaceable ceramic disc(Not included) allows for simple cleaning or replacement as needed, ensuring long term performance and hasslefree upkeep Size Chart:total height 12.5cm/4.92inch, diffuser 3.8cmx2.7cm/1.50inchx1.06inch, inner diameter 1.2cm/0.47inch Package Includes: 1 CO2 Diffuser  Note: Please allow slightly errors 1-2cm/0.39-0.79inch differences due to manual measurement.