MK11 (first stage)
The first stage, MK11, is balanced. This ensures that regardless of the depth and tank pressure, it always offers the same breath comfort. The MK11 is available in both Din and International and has 4 low and 2 high pressure outputs. Because of the extra thick membrane (which makes it good for saltwater), and because of the lightness and compactness, the MK11 is also very suitable for holidays.
When diving in extremely cold water, you could scale up to a MK17 EVO. That is a completely closed first stage. The system is completely sealed so that no water or dirt can enter the internal mechanism.