ISTA I533 Solenoid Controlled CO2 Regulator

Easy assembling: no tools required for attaching to the CO2 cylinder. Extremely precise needle valve assures accuracy and reliability in dosing the CO2. Strict quality control assures the best quality. Safety valve prevents any accidents if over pressure occurs. Two gauges: one shows the internal pressure (amount of CO2), the other shows the released pressure to the aquarium. (Solenoid : If you don't want to supply CO2 for 24x7 then Solenoid comes into account.It's a Power driven electro-magnetic valve which cut off the CO2 flow when switched off. If you want, you can use it to shut off the CO2 at night if required.)