What feature helps to optimize air delivery in certain second stages?

Venturi-assisted models enhance air delivery within second-stage regulators by utilizing the Venturi effect. This phenomenon occurs when moving air creates a drop in pressure, which can draw in additional air from the regulator. Specifically, in a Venturi-assisted second stage, as a diver inhales, the incoming air accelerates through a narrower section of the regulator, which decreases the pressure and helps pull in more air into the breathing stream. This design allows divers to breathe more easily, especially at greater depths or during rapid ascents and descents.

The integration of this feature can significantly improve overall breathing efficiency, making it particularly advantageous for divers who need enhanced performance from their equipment while exploring underwater environments.