<br>Item Type: Fish Tank Refiner <br>Material: 304 Stainless Steel <br>Color: As Pictures Shown <br>External Diameter: Approx. 32mm/1.26inch <br>Hole Diameter: Approx. 19mm/0.75inch <br>Optional Length: Approx. 7cm/2.76inch, 25cm/9.84inch, 30cm/11.81inch, 35cm/13.78inch, 40cm/15.75inch<br>1、Made of high quality stainless steel material, sturdy and durable, the diffuser is not easy to remove. <br>2、Exquisite craft, smooth and bright surface to provide a beautiful appearance for fish tank. <br>3、U?shaped design, easy to install and use to save much space. <br>4、Good effect, with the scientific design, the diffuser has the high and best CO2 dissolve rate. <br>5、There are several specifications for option, you can choose the suitable one according to your demands.Note: <br>1. this product cannot be used in salt water tank <br> <br>2. Using Instructions: <br> <br>Tighten when installing the refiner. Use of the new atomization will produce a large bubble, 24 hours after the disappearance <br>3. 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.1 x Stainless Steel Aquarium Refiner<div>1 x&nbsp;Hose</div><div>2 x&nbsp;Suction Cup</div>