The Phantom Aquatics Semi Dry Flex Snorkel's Streamline Oval-Shaped Bored Tube and Lower Flex Tube combined to make this Snorkel perfect for Scuba. The Lower Section Flex Tube Automatically-Swings Out-of-the-Way when you are using your Scuba Regulator. Snorkel has a Splash-Proof Dry Guard that virtually eliminates Water Intake through the Top of the Tube. Swim through Wind and Wave Spray without interrupting you breathing. If any Water enters the Snorkel Tube it can easily be Blown-Out with the Easy Purge Systems One-Way Valve with Extra-Large Self-Draining Chamber at the Bottom of the Snorkel Tube.