4mm CO2 tubing designed specifically for aquarium CO2 systems. This clear, flexible tube provides reliable gas delivery for planted aquarium setups, ensuring proper carbon dioxide distribution for optimal plant growth. Key features: • 4mm inner diameter • Clear, transparent design • Flexible and durable material • CO2-resistant construction • Compatible with standard CO2 equipment This specialized CO2 tubing is designed to connect CO2 regulators, diffusers, and other equipment in planted aquarium systems. The 4mm size is a standard diameter that fits most aquarium CO2 setups. For best results, ensure all connections are secure to prevent CO2 leakage. Regular inspection of the tubing is recommended to maintain optimal performance.