The MK25 EVO/A700 DIN300 pairs SCUBAPRO's MK25 EVO first stage with the A700 second stage. The MK25 EVO is a balanced diaphragm first stage engineered for high airflow and fast breathing response, and it performs consistently in cold water, making it a common choice for technical and cold-water diving. The A700 second stage uses a metal casing, a screw-down cover and a metal valve housing for durability under repeated use. Together, the two stages form a DIN300 configuration suited to divers who need reliable air delivery across a range of depths and water temperatures.