Product name: CO2 Material: 304 stainless steel+ aluminum alloy In order to achieve better results in water planting, we need to add carbon dioxide to the aquarium, which will make the plants grow faster, the colors are more vivid, and the leaves are thicker. The main function of the pressure reducing valve is to reduce the air source pressure and reach a stable value in order to obtain stable air source power. The double meter displays the inside pressure in the bottle and output pressure respectively, the bubbler counter accurately controls the air volume. The fine adjustment valve is used for adjust the gas output. Features 1. Double-meter configuration can clearly show the working status of CO2 system, lack of gas, excessive pressure or too small at a glance. 2. With professional sealing technology, it will not leak, safe and reliable. 3. The trim valve can precisely adjust the gas output, can be sensitively adjusted, and the output is stable. 4. Made of high-quality materials, it has several times higher pressure resistance than ordinary aluminum pressure reducing valves and has a longer life. 5. Check valve is injection moulded by acrylic tube, which can prevent water from entering the meter.