SCUBAPRO leads the way in piston-controlled first stages. The MK25 is the perfect example, bringing you ultra-stable intermediate pressure which ensures an instant and constant delivery of ultra-high airflow. You can count on incomparable performance for all diving conditions and at any depth. Made of chrome-plated, marine-grade brass, the MK25 will be your diving partner for a lifetime.
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Balanced-piston first stages are the first choice of demanding deep sport divers and professionals. First stages with air-balanced pistons deliver significantly more air to the second stage than any other first stage, while their performance is totally unaffected by changing tank pressure and depth. A balanced piston allows the use of lighter and more sensitive components, resulting in an ultra-fast breathing response, instant delivery of air on demand, and extra-high airflow, especially in low tank pressure ranges.
MK25 EVO First Stage: