Rugged reinforced technopolymer design features SCUBAPRO's largest second stage casing and diaphragm for the ultimate in breathing sensitivity, regardless of position in the water.

Air balanced second stage valve smoothes out the inhalation effort at varying depths and supply pressures.

A diver-adjustable inhalation effort knob fine-tunes air delivery to suit changing depths, water conditions and personal tastes, and a Venturi-Initiated Vacuum Assist (VIVA) dive/pre-dive switch prevents free flows in cold water or when used as an octopus.

High-flow exhaust valve reduces exhalation for better overall breathing comfort, and the reversible hose attachment allows you to easily adjust hose routing for tech diving configurations.

Super-flow hose features an oversized bore that allows more air to flow on each inhalation.

Air-balanced first stage diaphragm delivers constant and effortless airflow unaffected by depth, tank pressure, or breathing rate

Environmentally sealed system prevents water and pollutants from fouling the inner mechanism and is extremely resistant to freezing

Dry chamber is equipped with a double spring making it more compact and reliable.

Two opposing high pressure ports allow the first stage to be positioned either up or down, plus provide for an optimum hose/transmitter layout

Swivel turret comes with four High-Flow LP ports plus one axial Super High-Flow LP port to maximize hose routing options for technical diving layouts