Scubapro ESCAPE SEMI-DRY Snorkel.

Splashguard design helps keep water from entering the large-bore barrel while allowing abundant airflow. Includes an efficient purge valve and comfortable mouthpiece 

WITH SCUBAPRO SNORKELS YOU CAN ALWAYS BREATHE EASY. The ideal snorkel is always within reach when it's time to do some surface swimming. SCUBAPRO snorkels are hydro-dynamically designed for exceptional breathing performance, feature purge valves for easy clearing and specially-designed silicone mouthpieces for maximum comfort. Have it your way with a variety of SCUBAPRO snorkel designs perfectly matched for scuba diving, snorkeling, or both. SNORKELS DRY TOP This design completely seals the upper tube when the snorkel is submerged, so upon resurfacing no clearing is needed. SEMI-DRY This design’s splashguard top limits the amount of water able to enter the airway, making it easier to clear the snorkel. OPEN TOP Traditional design with a bare upper tube. Some are designed to be folded and stowed in a BCD pocket. PURGE VALVES One-way valves positioned just below the mouthpiece make clearing a snorkel much easier, because rather than having to force unwanted water out the top of the tube with a massive blast of air, you can expel it out the bottom of the tube using gravity and just a puff of air.