The AC2 1st stage is a non-balanced first stage with such high performance that it can be compared to lots of excellent balanced models. The small number of components, the low weight and the excellent materials make it the strongest Cressi first stages, and the most steadfast to maltreatment, a real ?working horse? amongst regulators. An ingenious bush system allows easy and rapid external regulation of the intermediate pressure.

The Octopus Ellipse 2nd stage uses the same casing as the Ellipse model made from special hi-tech polymers, the only difference being the yellow front cover. The hose is also yellow and is longer (100 cm against the standard 76 cm). All the parts of Ellipse, most of which are patented, can be found on this regulator: the fold-out opening of the casing, the special folding diaphragm, the computer designed lever, the tilting movement of the piston, the seal between regulator valve and casing, the possibility of extracting the entire valve system from the body of the 2nd stage. A flow of pilot air is channelled to the mouthpiece by injection, enhancing the performance.