Compact Sealed First Stage

Sealed balanced diaphragm design makes for the ultimate compact first stage for cold water or contaminated diving conditions.

Effortless Airflow

Air-balanced diaphragm delivers consistent and effortless airflow, regardless of depth, tank pressure, or breathing rate.

Environmentally Sealed Dry Chamber

Dry chamber is completely environmentally sealed with a dual diaphragm system that keeps out contaminated water. The rib is designed to enhance heat exchange, making the first stage cold water-proof.

Optimized Hose Routing

Two opposing high-pressure ports positioned on a 15º angle allow the first stage to be positioned either up or down, plus provide an optimal hose/transmitter layout.

Smooth Breathing Performance

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

Rugged Second Stage Design

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.

Extreme Cold Friendly

Metal components (inlet tube, orifice, inhalation control knob and hose connector) increase resistance to freezing when diving in extreme conditions.

Adjustable Breathing Controls

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

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

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