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Pro-Elite Series The Most Advanced Aquarium Dual Stage CO2 Regulator New Generation of our highest rated dual stage regulator Every detail has been designed with Aquarium Safety and Fine Precision in mind. Built for aquariums from 5 liters to 5000 liters! Dual stage construction minimise increase in output pressure as pressure drops in gas cylinder and will prevent end-tank-dump no matter what size CO2 cylinder you will use. New fully customised solenoid block with integrated high precision needle valves and bubble counter. Features : Safe 12V DC Integrated Solenoid Valve Power adapter with universal voltage 100V-240V Adjustable working pressure up to 5 bar Stainless Steel Dual gauge pressure indicators (tank volume and flow pressure/working pressure) High precision integrated needle valve Bubble counter with built-in check valve Extendable manifold block Due to Two Stages construction compatible with any size CO2 Cylinders. Perfect for any CO2 cylinder that follow Australian Cylinders. Looking to inject CO2 into two, three or more aquariums? Your Aquarium is +500L and requires more diffusers? Now you can add as many outlets as you like. With easy installation you can add or remove additional blocks anytime you want.