The MK25 EVO/S620Ti DIN300 pairs SCUBAPRO's MK25 EVO first stage with the S620 Ti second stage. The MK25 EVO is a balanced piston first stage built for resistance to freezing and consistent air delivery. The S620 Ti second stage is smaller and lighter than the earlier S600 while retaining the same diaphragm size, and it uses a full titanium inlet tube, a large purge button and a reengineered exhaust tee to direct bubbles away from the diver's field of view. Together, the two stages form a general-purpose DIN300 system suited to a range of water temperatures and dive conditions.