The new MK17 EVO is a high performance, balanced diaphragm first stage engineered especially for cold water or harsh dive environments. More compact than its predecessor, the MK17 EVO offers better breathing performance thanks to its improved internal design. Whilst allowing more airflow from the LP ports, the updated reconfiguration also aids better hose routing. Full-metal (chrome-plated marine grade brass) body and components and a dry ambient pressure chamber prevent it from freezing, ensuring trouble free operation even in the coldest conditions.