The SP-460 Imprex Hyperdry snorkel has a special angled chamber at the top of the snorkel that is offset from the main barrel. This unique chamber helps prevent water from entering the main barrel while you're snorkeling by simply deflecting incoming water. If water does get into the snorkel there's an underside purge valve that lets water drain out of the barrel without entering the air intake chamber of the mouthpiece.
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