Check the listing for details. VIVOSUN Hydroponics CO2 Regulator Emitter System with Solenoid Valve Flowmeter. Color: Gold, Condition: Open box. Listed at 29.00 USD. Enhance your hydroponics setup with the VIVOSUN Hydroponics CO2 Regulator Emitter System with Solenoid Valve Flowmeter. This top-quality CO2 regulator is designed to help you control the level of CO2 in your hydroponics system, ensuring optimal plant growth. The system comes with a solenoid valve flowmeter that allows for easy installation and management. The VIVOSUN Hydroponics CO2 Regulator Emitter System with Solenoid Valve Flowmeter is made of high-quality plastic and metal materials, making it durable and long-lasting. With a voltage of 110V, this CO2 regulator is suitable for any hydroponics application. Its lightweight design, weighing only 26 pounds, makes it easy to move and install.