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. With the unique design of Dymax's CO2 Regulator, its low energy solenoid generates minimal heat, which will not caused any damage to any parts of the regulator, making it safer and more durable than many other others on the market. The RX-122 is an ideal regulator for both the freshwater and marine aquarium.