The fully submersible dry top snorkel with one way purge valve.nQuick disconnect retainer design easily make accommodation of snorkel from mask.nColored whistle housing to get attention easily.nFlexible silicone corrugated low section, Pre-curved silicone mouthpiece.nGreat deal with the new items promotrion price, plus other special offers form GetWetStore on Amazon only.nA 100% submersible dry snorkel features upper valve and hinged seal keeps water from entering the snorkel as in submerge; but allows air to easily enter snorkel for clean and unobstructed breathing as on surface. Specially designed cover guards against water splashing into the snorkel. Slip-in snorkel keeper with quick release retainer. Flexible silicone corrugated low section bends easily. Colored whistle housing to get attention. Pre-curved silicone mouthpiece, prevents jaw fatigue. Silicone one way purge valve not only keep water out from snorkel but for easy draining.