A dedicated Nitrox delivery system that is certified for up to 100 percent oxygen, you can expect first-rate performance in all water temperatures. The new MK17 EVO is completely sealed off from the elements, ensuring trouble-free operation no matter how cold or murky the water gets. It is more compact yet delivers better breathing performance than its predecessor. Its improved internal design allows more airflow from the LP ports, which have been reconfigured for better hose routing. The S560 features a lightweight techno-polymer casing and full user controls. Simple and reliable, this system complies with the most stringent safety norms.