Year after year, in successive independent tests, SCUBAPRO’s flagship high-performance
first stage consistently ranks as the top-performing first stage on the market. With this
air-balanced flow-through piston-style first stage mounted to an air cylinder, you are
guaranteed superb inhalation sensitivity and instant delivery of air on demand, in all diving
environments and all water temperatures.

PATENTED EXTENDED THERMAL INSULATING SYSTEM (XTIS)
Fully insulates the inner mechanism from the environment, improving cold-water resistance by 30% and delaying ice formation. This radically increases breathing reliability when diving in extreme water temperatures.

OPPOSING HP PORTS
Allow the first stage to be positioned either up or down.

FIVE HIGH-FLOW LP PORTS
Provide 15% higher airflow than standard low-pressure ports. They are also mounted on a swivel turret to maximize hose routing options