Fusion 52X from Mares represents a radical departure from any existing regulator. The bypass, has undergone a true transformation: 77% increase in flow cross section and double curvature to provide a smoother flow while optimizing performance. For the first time a second stage regulator is equipped with a flow control (Twin Power), managing the delivery rate of gas from natural breathing to power breathing. The new valve system in the 52X delivers a 600% increase in durability even under the most extreme conditions. Both first and second stage feature a new satin finish making them stand out from the crowd.