Apeks Comfo-bite mouthpiece has a unique bridge that fits across the upper palate and does not require bite pressure to stay in place. The patented Apeks Comfo-Bite Regulator Mouth piece is the standard mouthpiece fitted to all Apeks primary second stages, plus many Aqua Lung second stages, including Aqua Lung snorkels. The Comfo-bite mouthpiece virtually eliminates jaw-fatigue