Divers the world over turn to the Impulse Snorkel due to its efficiency and comfort. The Impulse 3 is the latest snorkel from Aqua Lung. This snorkel is more streamlined and performs better than the Impulse and Impulse 2. The Impulse 3 utilizes a two valve system. When a wave breaks over the snorkel, the upper annular value sends most of the water out before it can reach the mouthpiece. Water that does pass the annular valve is drained out through the lower valve. Your breathing path is kept clear of excess water thanks to the reservoir. Nearly no breath is needed to clear the Impulse 3, you need to simply puff lightly. Jaw fatigue is eliminated with this snorkel thanks to the Comfo-bite (replaceable) mouthpiece. An optional smaller size mouthpiece is available as well. The Impulse 3 is also available in a non-flex, standard version.