High Precise pressure release valve (low Pressure),More simply using Accurate fine-tuning(regulate to 1 bubble/2-3 sec). The bubble guage with inverse valve(regulation can be seen). Design using the new pressure washers, no wrench Noiseless:100-240 V wide voltage input, DC 12V output, the solenoid valve is UPGRADED 12 V noiseless version. Suitable For:G 1/8 interface trim valve fits for the single head solenoid valve. If not the G 1/8 interface, fits for the 4*6mm air pipe(inner diameter 4mm and outer diameter 6mm) Nuts locking design for CO2 pipe connection, anti-shedding and good sealing,no leaking. Settable:Turn On and Off automatically when used with a timer. Timer can connect your aquariums lighting system and cuts off the CO2 supply depending on light Keeping your aquatic plants healthier, more convenient and save energy. Durable And Easy to Install:Be made of aluminium alloy material, strong and sturdy,Low temperature design, temperature below 30, low heat and low noise,According to the user's need to control the outlet time, convenient, stable and easy to install. Safety: High-quality power cord 2*0.5mm2 ( the total length of the power cord is 1.4 meters with long plug), with "anti-shock" charger, safety and no safety hazards