The Impulse Snorkel continues to be the snorkel of choice for divers all around the world. Its popularity is due to the highly efficient upper valve system, which guides excess water away from the main airway preventing water from reaching the mouthpiece. The Impulse 3 is an improved, more streamlined version of the original! Features include: To provide the driest breathing snorkel possible, the Impulse 3 usesa two-valve system. If a wave breaks over the snorkel, the PATENTED,upper, ANNULAR VALVE directs most of the water out before it evenreaches the mouthpiece. Any water that does get past the annular valveusually drains out the lower valve. The reservoir located below the mouthpiece keeps breathing path clear of excess water. In the rare event that you need to clear the Impulse 3 Snorkel, almost no breath is needed. All it takes is an easy puff. Theunique design of the Impulse 3 snorkel, with its large bore, deliversextremely low breathing resistance while the body of the snorkelcreates little drag. Patented Comfo-bite mouthpieces, which eliminate jaw fatigue, are replaceable and an optional, smaller size is available Removable keeper allows easy attachment or removal of the mask.