TUSA Sport USP-250QB Dry Snorkel The USP-250QB dry snorkel features TUSA Hyperdry Elite dry top technology (pat p) that stops water from entering into the snorkel, a drain chamber and purge valve for easy clearing, and silicone mouthpiece.  FEATURES Pure Silicone Flex-Neck and Mouthpiece Patented Hyperdry Elite Dry Top Technology Large capacity drain chamber and purge valve for easy clearing Ortho-consciously designed mouthpiece for ultimate comfort