Bullet-proof reliability & minimal maintenance. This time-tested design is a classic for a reason. Its straighforward mechanism allows for greater control of the tank’s pressure drop while it feeds the second stage. Now ushering in a new era of cold water protection, the Extended Thermal Insulating System (XTIS) fully insulates the inner mechanical components, increasing the cold-water protection rating by an impressive 50%. This continuously updated classic downstream piston regulator remains as popular as ever, especially in schools and training centers. Compact, simple and reliable, the MK2 EVO is built for easy maintenance and great performance.