Tusa Imprex II Hyperdry Scuba Diving SnorkelThe SP 580Q Imprex II Hyperdry snorkel features a dedicated internal purge channel located below the mouthpiece. It channels exhaled air out the top of the snorkel while excess water drains through the bottom purge valve. The Hyperdry System keeps the main tube dry by ejecting water through an independent escape pipe. This design leverages the angle of the snorkel and water surface tension to push water out quickly, reducing water in the mouthpiece