This is the Tusa Platina II Snorkel with HyperDry and Crystal Silicone Flex Neck and High-FLow Purge Features: Hyperdry system with three current rectifying plates High flow and angled purge valve to eliminate gurgling of water and allow bubbles to pass by the face when purged Ortho-consciously designed mouthpiece for ultimate comfort Crystal silicone flexible neck Detachable two-section swivel adapter for free movement Three-dimensional pipe curve for the ideal angle for snorkeling The SP-170 Platina II Hyperdry snorkel is TUSA&';s premier semi-dry snorkel incorporating several features such as the patented Hyperdry System making this one of the most stylish and feature packed snorkels on the market.