SCUBAPRO engineers have taken some of the best features from our past air-balanced first stages and created the all new MK19 EVO. It is environmentally sealed, preventing water and pollutants from entering the inner mechanism. The MK19 EVO adopts a new dry ambient pressure chamber that enhances freezing resistance while ensuring consistent airflow and maximum durability in the coldest conditions. With a swivel turret and five LP ports which maximize hose routing options, this first stage is built not only for professional, military and technical divers, but also for recreational divers who need superb cold water performance in a lightweight, small, compact size.