1. You can control the air flow by switching or turning off the valves. 2. Made of high-quality stainless steel, it is and not easy to rust, which is very suitable for aquarium. 3. Multi-outlets allow you to adjust the air flow for multi-fish tanks. 4. This distributor can be used for aquarium, hatchery and aquaculture applications. 5. Easy to operate and suitable for most aquarium users. Item Type:Aquarium Air Flow Control Distributor Feature: Ways:10 Colour:silver Material:Stainless steel Size:about 192mm Package Contents: 1 x aquarium air flow distributor Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.