Features: Achieve a balanced aquarium environment with the CO2 Regulator. Maintain proper levels for healthy fish and plant growth. The CO2 Regulator features a solenoid and adjustable needle for control of output. Customize the flow rate to meet the specific needs. Designed for both home and professional use, the SolenoidValve is perfect for aquarists and hobbyists looking to improve their aquariums. Suitable for plantedtanks, this regulator ensures conditions for plant growth while preventing algae formation. Widely used in gas supply system, beverage machines, aquariums and other fields to ensure a stable gas supply and meet different needs. Specifications: Material: Aluminum Alloy+Plastic Size: Approx. 46x46mm/1.81x1.81inch Package Includes: 1x CO2 Regulator SolenoidValve note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the differences between different monitors, the picture may not reflect the actual color of the item.