Specifications: Color: Silver Material: Aluminum alloy (main body) + copper (Internal valve needle) Pressure relief method: Automatic/Manual CO2 System Main Body: Aluminum alloy material link forming Bubble Counter: check valve bubble counter Solenoid Valve: 12v waterproof (not included) Pressure gauge: special aquarium low pressure gauge accuracy: 0.02 MPa Regulator trimmer valve: full copper internal valve needle upper opening removable for cleaning Anti acid buildup: lateral tee design ensures full reaction of raw materials Features: 1.Full aluminum alloy main body design with hard oxidation treatment safe and durable much better than plastic hose simple and easy to set up 2. Aluminum alloy bottle caps good pressure resistance prevent the caps from bursting 3. Specialized aquarium low pressure gauge accuracy: 0.02 MPa 4. Upper opening removable trim valve easy to clean even if the regulator is clogged inside 5. Precise adjustment of CO2 ouput volume adopted full copper needle valve fine-tune regulator to ensure the accuracy 6. 12V miniature waterproof solenoid valve(not included) completely avoid to the 110V electric shock danger of soaking water lower temperature and less noise than 110V solenoid valve. Only needs to adjust the CO2 output volume once and use it in synchronization with lights by the timer. 7. Full aluminum alloy precise check valve bubble counter totally avoid the danger of plastic thread parts breaken because softening. 8. This aquarium CO2 DIY system is designed for low cost plants tank use save money and get more fun. Package: 1* CO2 System DIY Kit (Accessories: 1* Bubble Counter 1* Pressurized Gauge Full Set Air Hose Seal Pads 2* Suction Cup Clips) includes: "