This is the Oceanic Ultra Dry 2 Flex Purge High Quality Snorkel for Scuba Diving or Snorkeling Features: Great fresh colors and look with same quality features and function Remains practically desert-dry even at depth Patented Dry Snorkel Technology: Eliminates water from entering barrel Allows easy airflow and comfortable breathing Ergonomic design, reduces resistance and drag Drop-away corrugated section Corrugated section feature: reduces jaw strain when snorkeling Replaceable 100% liquid silicone rubber mouthpiece Extremely comfortable for hours of snorkeling fun One-way purge valve w/dual exhaust valves Quick-Lock" clip to attach/detach Do you chew on your snorkel mouthpiece? If you do, not to worry: the Ultra-Dry 2 has a 100% liquid silicone rubber mouthpiece which can be easily replaced. It is also extremely comfortable for hours of snorkeling fun. Water drains quickly and easily through the one-way purge valve below its mouthpiece and the dual exhaust valves on the bottom. Best of all, water is eliminated with very little effort by the user. "