Promate Cobra Dry Whistle Snorkel | sk680:
*A unique, 100% absolute dry design -- Patented upper valve keeps water from entering the snorkel.
*Allows air to easily enter snorkel for clean and unobstructed breathing.
*Specially designed cover guards against water splashing into the snorkel.
*When the dry snorkel is submerged in water, the patented hinged seal reacts to seal the snorkel, preventing water from entering.
*As you surface, the hinged seal swings open allowing air to enter.
*Built-in whistle housing.
*Quick slip-in snorkel keeper.
*Pre-curved flexible silicone corrugated low section.
*Easy purge valve keeps stocking water out -- When feel water stocking in the bottom of the snorkel, simply squeeze the easy purge valve and spit out, which drains water from the bottom of purge that *keeps the airway clear.
*Pre-curved silicone mouthpiece, prevents jaw fatigue.
*Silicone purge valve for easy draining.