Red Sea RSK high performance skimmers incorporate a combination of Sicce RSK pumps for improved performance and reliability, which push a balanced amount of air and water through the hydrodynamic bubble diffuser, optimize the air-water contact time during operation, for stable removal of organics in the aquarium. Designed in close collaboration with enthusiasts- aquarists, they fully meet their needs- quiet, thanks to rubber seals and feet, which suppress vibrations and a serious silencer. The Foam View™ option allows you to monitor the level of foam in the throat and in the cup, the built-in device for cleaning the neck of the skimmer optimizes its service,a long drain hose with a valve, enables connection to an external waste water collector and cleaning by turning the valve , without the need to remove the cup. Skimmers are easy to assemble and disassemble, easy to set up and control the water level, convenient for positioning, even in tighter sumps.