| The
Apeks Integrated Venturi System (IVS) controls the air flow through
the second stage, allowing air to flow directly through the mouthpiece
to the diver or be re-directed against the diaphragm. The venturi
lever therefore acts as a pre-dive switch. Set in the minus position
the second stage cannot freeflow if accidentally dropped in the
water. When the diver begins to use the regulator the lever can
be switched to the plus position and the second stage will give
full venturi assistance to the diver, reducing breathing effort. |
