Feature: 1. Fine Bubbles: Aquarium air stone disc atomization fine, can produce a large number of dense bubbles, air cleaning more efficient. 2. Easy To Use: Fish tank air stone disc with check valve, suction cup, adjustment switch and other accessories, easy to install and use. 3. Oxygenation: Fish tank bubble disc has high oxygenation efficiency, can be used to provide oxygen for aquarium quickly. 4. Reusable: This aquarium bubble diffuser disc can be cleaned after use, easy to reuse many times. And regular cleaning can prevent clogging. 5. Stable: The aquarium oxygen diffuser has the right weight and size with a suction cup to suck tightly on the tank and make it sit stable in the water. Specification: Item Type: Aquarium Air Stone Disc Material: Stainless Steel Connectable Hose Diameter: Approx. 4mm/0.16in Applicable Fish Tank: 150cm/59.1in. Package List: 1 x Aquarium Air Stone Disc1 x Check Valve1 x Tee Pipe1 x Suction Cup1 x Adjustment Switch Note: Manual measurement, please allow some errors.