12V Output Voltage Aquarium CO2 Regulator Adjustable CO2 Pressure Regulator with Solenoid Large Double Pressure Gauge Bubble Counter & Check Valve for CO2 Aluminun Cylinder W21.8 Interface This CO2 regulator is specifically designed for the CO2 generator system. Install this CO2 pressure regulator that needs a wrench. Place the washer ensure a tight seal. Replace washers regularly recommended. It is easy, safe, and economical. Features: Be made of aluminum alloy. It is strong, durable, and efficient. Well-sealed caps, leak-proof, non-deformed, never loose. Install this CO2 pressure regulator that needs a wrench. Place the washer ensure a tight seal. Replace washers regularly. Professional pressure gauge for pressure watch. The high-pressure gauge shows cylinder pressure, low pressure gauge shows output pressure. Large double pressure gauge: Safe and with long service life, regulated output, stable operation. Pressure reducing valve: High-pressure input, output pressure can be adjusted between 0-6kg. Solenoid valve: To control the on and off of the CO2 generator system using a timer(not included). 100-240V wide voltage input, DC 12V output, the solenoid valve is 12V noiseless version. Bubble counter with a check valve: Flow-rate of CO2 gas indication device and prevent water flow back into the bottle. Precision fine-tuning, achieving 2-3 seconds 1 bubble. Any problem, please contact our store without hesitation. Honor to serve you! Specification: Name: Aquarium CO2 regulator Main material: Aluminum alloy Color: Silver Optional interface type: CGA320(US); W21.8(EU) Input voltage: 100-240V Output voltage: 12V Size: Total height 130mm; Double watch diameter: 40mm Package Information: Package size: 16.5*13.5*11cm Package weight: 600g Gift Box Packaging Package List: 1* Aquarium CO2 regulator 1* Wrench 1* Instruction manual 1* Other parts