This CO2 regulator is specifically designed for CO2 generator system. Install this CO2 pressure regulator need a wrench. Place the washer ensure a tight seal. Replace washers regularly recommended. It is easy, safe and economical.Features:Be made of stainless steel. It is strong, durable and efficient.Well-sealed caps, leak-proof, non-deformed, never loose.Professional pressure gauge for pressure watching. 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 voltage input constant voltage output 3KG pressure.Solenoid valve: To control the on and off of CO2 generator system using with a timer(not included). 100-240V wide voltage input, DC 12V output, the solenoid valve is 12V noiseless version.Bubble counter with 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.Install this CO2 pressure regulator need a wrench. Place the washer ensure a tight seal. Replace washers regularly.Any problem, please contact our store without hesitation. Honor to serve youSpecification:Name: Aquarium CO2 regulatorMain material: Stainless steelColor: SilverOptional interface type: W21.8/CGA320/G5/8Input voltage: 110V (US); 220V (EU)Output voltage: 12VSize: 16.9*15cmPackage Information:Package size: 24 * 22.5 * 13cmPackage weight: 595gGift Box PackagingPackage List:1* Aquarium CO2 regulator1* Wrench1* Instruction manual1* Other parts