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. 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