This is the Mares ROVER OCTO Scuba Diving Regulator Octopus Features: Easy-to-use purge button with dynamic hinge design Vad system with fluid dynamic deflector Mid-size Oversized purge button Rubber hose Abrasion resistant and affordable, ideal for diving in warm and moderate water temperatures. Patented design which reduces the impact of water flow onto the second stage diaphragm, thus eliminating free flows even in strong currents. Receives and properly directs the airflow from the bypass tube to the mouthpiece. 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. Mares ROVER OCTO Scuba Diving Regulator Octopus.