brand new and high quality Features: Made of stainless steel, far better than simple plastic bottle generator, more durable, stable, safe and high pressure resistant. Automatic pressure relief for valve, when the pressure of the inside steel bottle exceeds 30KG will automatically release pressure. 12V Waterproof solenoid for valve,Keep away from the danger of water leakage from the solenoid for valve, protect your safety. The CO2 generator system equipped with the atomizer, refine the bubbles and make it easy to dissolve in water and be absorbed by plants, Keep your aquarium full of vitality. When using this product for the first for time, there will be large bubbles in the refiner, which will gradually disappear within 3 days. Generates CO2 on your own: you only need citric acid, baking soda, and water which are available in supermarkets. When the gas in the bottle runs out, you only need to purchase the material again. Aquarium CO2 Generator Set only,other accessories demo in the picture is not included. Specification: Material: Stainless Steel Size: app.42x9cm/16.54x3.54in Color: As the pictures shown Plug Style: EU Quantity: 1 Set Note: No retail package. Please allow 0-1cm error due to manual measurement. pls make sure you do not mind before you bid. Due to the difference between different monitors,the picture may not reflect the actual color of the item. Thank you! Package Contents: 1 Set x Aquarium CO2 Generator