Cressi is one company that calls it like they see it. One example is the Cressi Dry snorkel. Who needs a fancy name, Cressi decided to keep it simple and simply name the snorkel Dry.
The dry design on the Cressi Dry Snorkel, features a close access to the breathing when the top of the snorkel drops below the surface of the water. Once the top of the snorkel goes above the waterline the valve reopens. The corugated flex tubing on the Cressi Dry Snorkel allows the snorkel to drop out of the way when switching to the regulator. The flex tube is corrugated on the outside. The inside surface is smooth as not to trap water should the barrel have water in it. The Cressi Dry Snorkels purge valve at the snorkel's base, makes snorkel clearing simple should the need arise. The silicone mouthpiece has a comfortable bite and is user replaceable.
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