Eshopps PSK 150 In Sump Protein Skimmer 100-150 Gallon Tank combines performance and easy installation. It is designed with simplicity in mind to satisfy the skimming needs of saltwater aquarium hobbyists. The removable collection cup allows convenient skimmer maintenance and disposal of collected waste material. It includes adjustment knob fine-tunes water level within the protein skimmer reaction chamber for optimal performance.