Dymax CO2 Mini Regulator is designed to regulate a constant and accurate supply of CO2 for aquarium use. This product is made with high quality solid cast aluminium that makes it light weight as well as corrosive resistant against salt water. The regulator is hand tighten and uses gas to pressurise the inner silicone “O” ring so as to further fasten between the cylinder connections to prevent gas leakage. To be used with Dymax Disposable Cylinder.