Mares Rover 15X Dive Regulator Scuba Diving 416236 Ultralight Technopolymer Abrasion resistant and affordable, ideal for diving in warm and moderate water temperatures. Mesh Grid Patented design which reduces the impact of water flow onto the second stage diaphragm, thus eliminating free flows even in strong currents. VAD - Vortex Assisted Design The air bypass tube delivers air to the mouthpiece creating a swirling vortex with a low pressure area in the center that keeps the diaphragm down during inhalation, for very sensitive and easy breathing at all depths. Twin Power New, flow control manages the delivery rate of your gas, from natural breathing to power breathing. The former is the traditional way of breathing a Mares regulator, (VAD) while the latter (VAD+) provides an extra push when you need it. Fluid Dynamic Deflector Receives and properly directs the airflow from the bypass tube to the mouthpiece.