NIUNIU High Quality:Aluminum alloy CO2 aquarium atomizer, safe, energy-saving, and environmentally friendly. Design:Fixed with U shaped plug, the height can be freely adjusted, and the U-shaped plug tube can prevent CO2 flow blockage. Very quiet operation: CO2 is added to your aquarium with little notice and no annoying whistles or other distractions. Easy to install:The CO2 bubble diffuser is easy to install and easy to use. With two functions of hanging or attaching to the tank wall by suction cup. Performance: High density aquarium atomizer produces small bubbles , which increases the dissolution rate of carbon dioxide and is not easy to block the fish tank. Delivery Quantity: 1pc, Package Contents: Only the above package contents, excluding other products. Size: diameter 24mm, length 6cm (Reminder: The size is measured manually, please allow 1-2 cm measurement error) Color: silver (Due to different monitors and lighting effects, the actual color of the item may be slightly different from the color shown on the picture.)