Features: The surfaces is anodized with high-strength aluminum material, which is corrosion-resistant, durable and has a long service life. No resistance, no influence on the water flows, large thinning area, increase the dissolution rate, and save the amount of CO2. With a small window, the observation window and the strong water flows design are combined into one, and the refinement effect can be observed through the small window. Install the product on the outlet pipe of the filter bucket, and then open the filter. Install the carbon dioxide equipment and air pipes, open bubble fine adjustment valves, and hold it for 5-10mins, let the high pressure fully open the air hole, and then adjust the fine adjustment valves to normal output. Visible 12 external atomizer is connected with a hose with an inner diameter of 12mm, and visible 16 external atomizer is connected with a hose with an inner diameter of 16mm. Specifications: Material: Aluminum Type:1/2/3/4 1:Approx.50x65mm/1.97x2.56inches 2:Approx.50x65mm/1.97x2.56inches 3:Approx.52x110mm/2x4.33inches 4:Approx.52x110mm/2x4.33inches Package Includes: 1x Co2 Atomizer note: 1.Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. 2.Due to the difference between different monitors, the picture may not reflect the actual color of the item.