Dymax CO2 Professional Regulator RX-122 CO2 is arguably the most important element in the planted aquarium. It is required for respiration and growth by all aquatic plants, used in a process called photosynthesis. In the wild, plants get their CO2 in large quantities naturally from substrate (mud) and degrading plants. However, in a enclosed aquarium, CO2 is very limited. Water from your tap is depleted from CO2 and plant decay in an aquarium is minimal compared to the wild. This is why many aquarists have found out that supplementing CO2 really does help their plants grow much better and a lot stronger. So, when only the best will do the Damax range of Aquascaping and planted tanks brings you the best range in equipement. The Dymax CO2 Professional Regulator RX-122 provides accurate regulation of CO2 for the aquarium. The regulator is made of solid aluminium, providing corrosion resistance against salt water. Besides being light in weight, the regulator also requires no tools for fastening onto the cylinder. Common leakage problems of other regulators is often caused by high heat generated by the solenoid valve during operation through expansion. The unique design of Dymax's CO2 Regulator, which creates low energy and minimal heat by the solenoid, will not cause any damage to any part of the regulator, making it safer and more durable than many other regulators on the market. The RX-122 is an ideal regulator for both the freshwater and marine aquarium.