Scubapro MK25 EVO First Stage DINMK25 EVO First Stage, DIN Scubapro has been the Leader in the Evolution of piston controlled first stages since its beginning; the MK25 EVO carries on this heritage with an array of patented features ensuring unfailing performance. The MK25 EVO is a balanced piston first stage, Scubapro's absolute top performer. It is a superior regulator thanks to its ultra stable intermediate pressure (IP) resulting in an extremely punctual and constantly high