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【External Installation】: This inline CO2 diffuser mounts outside the aquarium, connecting between the filter and tank hoses. It keeps the interior clear without obstructing views, making maintenance easily while preserving the fish tank aesthetics. 【Efficient Dissolution】: Positioned in strong waterflow areas, this CO2 diffuser creates fine bubbles that diffuse effectively without resistance. The large diffusion area maximizes CO2 dissolution, reducing gas consumption while improving absorption efficiency. 【Replaceable Diffuser Plate】: The CO2 diffuser plate produces consistent fine bubbles. It's easy to clean and replace when needed. 【Built-In Non-Return Valve】: The CO2 diffuser integrates a check valve to avoid water backflow, protecting your CO2 system. This external CO2 diffuser works reliably with 12mm, 16mm, or 20mm filter hoses using included clamps for sturdy connections. 【CNC Aluminum Construction】: Machined from high-strength aluminum with surface anodizing, this aquarium CO2 diffuser resists corrosion and maintains performance over time.