【High Quality】Aluminum Alloy,CNC Precision Machining, Strong and sturdy, Anodized Surface,not Easy to Rust, Strong Corrosion Resistance, Long Service Life 【Constant Pressure Output】Built-in constant pressure valve, constant pressure output, stable gas volume.Aquatic Plant Tank CO2 System Pressure Regulator, Compatible With W21.8 Or G5/8 Interface Cylinder (optional) 【Protect Plant Growth】The Needle-type Fine-tuning Valve Has High Adjustment Accuracy and Can Be Adjusted as Low as 5S/bubble. Always inject the right amount at the right time to keep your plants growing the right way. 【Single /Double Meter Display】Large Screen,Real-time Monitoring of the Operating Status of the CO2 System, Clear Display and Easy Reading of Data 【SHOP WITH CONFIDENCE】To Provide You With the Highest Quality Service, If You Have Any Question, Please Contact Us.We Will Provide After-sales Service ., Weight: 0.220462262 Pounds, Manufacturer: DONGKER