Feature:1. Made of high quality stainless steel material, sturdy and durable, the diffuser is not easy to remove.2. Exquisite craft, smooth and bright surface to provide a beautiful appearance for fish tank.3. Ushaped design, easy to install and use to save much space.4. Good effect, with the scientific design, the diffuser has the high and best CO2 dissolve rate.5. There are several specifications for option, you can choose the suitable one according to your demands.Specification:Condition: 100% Brand NewItem Type: Fish Tank RefinerMaterial: 304 Stainless SteelColor: As Pictures ShownExternal Diameter: Approx. 32mm/1.26inchHole Diameter: Approx. 19mm/0.75inchOptional Length: Approx. 7cm/2.76inch, 25cm/9.84inch, 30cm/11.81inch, 35cm/13.78inch, 40cm/15.75inchPackage List:1 x Stainless Steel Aquarium Refiner1 x Hose2 x Suction CupNote:Note: 1. this product cannot be used in salt water tank2. Using Instructions:Tighten when installing the refiner. Use of the new atomization will produce a large bubble, 24 hours after the disappearance3. Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.