MK17 EVO First Stage:
- Air balanced 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.
- More compact design features a smaller dry ambient pressure chamber and spring, although the bulletproof inner parts remain the same.
- Dry ambient pressure chamber increases freezing resistance, ensuring consistent airflow in the coldest conditions.
- Substantial increase in airflow -- 6900 l/min versus 6500 l/min - includes improved balance of air supply pressure.
- Two high pressure and four high-flow ports maximize air delivery and hose routing options.
- High-flow performance is available from all four LP ports which are configured for optimum hose routing.
- Available in a 3364psi/232bar INT configuration.
- Weight: INT 232 - 30oz/850g.
- Airflow at 2900psi/200bar: 6900 l/ min - 230 SCFM.
- Intermediate pressure (psi/bar): 130-142/9.0-9.8.
A700 Second Stage:
- Air-balanced valve smoothes out the inhalation effort at varying depths and supply pressures.
- Rugged full metal case, front cover and valve housing are able to withstand years of aggressive diving.
- Metal construction enables the use of a larger diaphragm inside a compact casing, increasing breathing sensitivity.
- User controls include a diver-adjustable inhalation effort knob and coaxial-flow Venturi-Initiated Vacuum Assist (VIVA) lever.
- Super-flow hose features an oversized bore that allows more air to flow on each inhalation.
- Ultra-comfortable orthodontic mouthpiece is easy to grip yet doesn't inhibit airflow.
- Weight: 9.3oz/265g.
- Airflow at 2900psi/200bar: 2000 l/ min - 71 SCFM.
- Maximum low pressure: 203psi/14bar.