The SV2 is designed to limit splashed water from entering the breathing tube, by combining the Scupper Valve lower section with the sleek looking SV2 Semi-Dry top.  SV2 is the perfect snorkel for rough or choppy water conditions.

Just like the one-way Scupper Valve on a boat, the lower section of both the SV1 and SV2 snorkels allow water to be easily expelled. Any water entering the top of the snorkel bypasses the mouthpiece completely and exits out the purge valve. If water did enter the internal tube located inside the main snorkel body, it contains a small one-way Scupper flap valve, designed to allow water to flow past the mouthpiece and out the purge valve without collecting at the bottom of the breathing passage. The diver simply exhales a small burst of air to clear any water trapped below the mouthpiece, and the internal tube airway is kept dry.