POWERBREATHER SNORKEL

The Powerbreather is a breathing system (based on the concept of a sealed snorkel) and developed in Germany. The system uses a patented air flow pumped by a valve mechanism. The Powerbreather allows only air to pass through the pipe leading to the mouth of a swimmer. The Powerbreather avoids strain on the neck muscles, which is usually done by turning the neck and head, in order to breathe. Thus, the Powerbreather allows the swimmer to concentrate on his/her technical improvements. The water can not enter the system, even with the swimmer immersing further, because the two valves only allow  air to be inhaled. source