The SV1 Flex is designed with a conical flared top with flex lower section to deliver maximum airflow. Any water trapped below the mouthpiece is easily cleared with a small burst of exhaled air, and the internal tube airway remains dry even if water enters the top.

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.