Red Sea Fish Pharm ARE50033 3-Pack Wooden Airstone for Aquarium
Red Sea air stones work best in saltwater where they give off a fine mist of air. Made of wooden material. Used in protein skimmers. Fits both berlin air lift skimmers. Its a high performance, internal skimmer based on the Berlin triple-air-pass principle. The berlin air-lift is easy to install and maintain. Includes 3 piece per pack.