Patented dry snorkel technology virtually eliminates water entry. Oversized purge valve for easy clearing. Quick release swiveling snorkel keeper. Drop away smooth bore flex mouthpiece. Replaceable 100% liquid silicone mouthpiece. Oceanic Ultra Dry SCUBA Diving Snorkel Designed to be exactly what its name suggests, the ULTRA DRY snorkel incorporates Oceanic's patented Dry Snorkel Technology into an ultra-low profile product that is ergonomically designed for comfort and function. Patented dry snorkel technology virtually eliminates water entry. Oversized purge valve for easy clearing. Quick release swiveling snorkel keeper.