This co2 solenoid valve for Aquarium Features 360 adjustment, dual display, can simultaneously observe the pressure of the steel bottle and the output pressure of the fish tank, stable release of light small bubbles, no need to adjust frequently, low voltage is not easy to electric shock, waterproof and dustproof, no noise. Features: 360 adjustment, dual display, can simultaneously observe the pressure of the steel bottle and the output pressure of the fish tank. Stable release of light small bubbles, no need to adjust frequently. Low voltage is not easy to electric shock, waterproof and dustproof, no noise. Newly designed solenoid valve, can be used with a timer socket to automatically control the switch of CO2. The connection line is built-in with a wire card to prevent falling off. Specifications: Material: Aluminum alloy Package Size: 16.5cm x 14cm x 11cm / 6.5in x 5.5in x 4.3in Package Weight: 560g / 19.8oz Package List: 1 x CO2 Solenoid Valve Set