This is the Tilos 100% Dry Snorkel with Purge and Crystal Silicone Mouthpiece Features: Designed to provide completely dry breathing for both divers and snorkelers Prompt clearing through bottom drain valve Adjustable mask strap retaining clip Crystal silicone mouthpiece S560 This 100% Dry Snorkel uses the latest technologies to provide the diver with an easy breathing and most importantly a dry experience.