The SP-580Q Imprex II Hyperdry snorkel has a special internal purge channel located below the mouthpiece. It channels exhaled air out the top of the snorkel while excess water drains through the bottom purge valve.

Features:
Hyperdry System.
Large capacity drain chamber and oval purge valve with internal purge channel.
Ortho-consciously designed mouthpiece for ultimate comfort.
Crystal silicone flexible neck.
Hyperdry Technology
The exhaust pipe features a special crosscut design to allow for quick, efficient clearing. The Hyperdry system helps to keep the snorkel clear and the mouthpiece is specially angled for a perfect fit in your mouth.

Oversized Drain Chamber and Oval Purge Valve For Easy Clearing
The SP-580Q has a special internal purge channel located below the mouthpiece which deflects exhaled air out the top of the snorkel while excess water drains through the bottom purge valve.

High Flow Channel and Purge Valve
Since the purge valve is at an angle to the body, after clearing the snorkel, even if water remains in the chamber it will not affect the flow of air in the pipe (away from the mouth). Therefore, there is no gurgling of water caused by breathing, and water does not return to the mouth. Also, air bubbles that come from the valve pass by the side of the face without obstructing the field of view.