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The refillable 1 litre CO2 Aluminum Cylinder included in this set features a face-up connection, for easy, convenient installation. It is DOT approved, safety and quality assured, and its surface has been treated with epoxy resin coating, to ensure it remains free from oxidation. The included Precise CO2 Pressure Regulator which attaches to the cylinder ensures your water is being reliably and accurately dosed with CO2, at an adjustable rate. Easily reduce or increase the amount of CO2 released into you aquarium, based of your plants needs, with the simple twist of the knob on the regulator.