Feature:1. Fine workmanship: The overall mirror surface is finely polished, which complements the aquatic plants beautifully.2. Simple Installation: Easy to install, connect to PU pipe for use, freely adjust the length according to the height of the cylinder.3. Easy to Disassemble: Easy to unscrew, simple to change the film, the surface is non slip knurled design.4. High Quality Materials: Aluminum alloy material, polished surface, anti corrosion, anti rust, longer life.5. Rugged and Durable: The sturdy aluminum structure is sealed with an o rings, which is easy to clean and maintain.Specification:Item Type: RefinerProduct Material: Aluminum AlloyExternal Trachea: Approx.4mm/0.2in Caliber TracheaRefining Cup Diameter: Approx.2.4cm/0.9in.Package List:1 x Refiner1 x SuckerNote:It needs to be soaked in water for 24 hours before use, the bubbles are bigger and more, the air is evenly discharged, and the effect is better.