Aquarium Co2 Proof Tubing Id 5/16 Inch 16 Feet Clear Food Grade Air Line Tubing

Made of PU Kink-Free DesignTransparent and No Smell. 4mm Inner Diameter6mm Outer diameterEasy to hide. Great for indoor garden hydroponics and modern aquariums Special CO2 Resistant Tubing loses less than 1% of CO2 Fits all Fzone regulators and Air pumps. Safe for fresh or salt water environments.