The Apeks Comfobite mouthpiece is the standard mouthpiece fitted to all Apeks primary second stages and features a bridge that joins the two bite tabs together. The purpose of the bridge is to shield the roof of the mouth from the filtered compressed air as it passes out of the mouthpiece to avoid a dry out your mouth.
Diving compressed air is, at a minimum, double filtered to remove contaminants and moisture. Whilst this is essential for the diver's health it does lead to the mouth drying out very quickly which is particularly noticeable on the roof of the mouth. The bridge helps to keep the roof moist and reduce the discomfort.
The entire mouthpiece is made from very soft black silicone with all edges smoothed and rounded for a comfortable fit, even on prolonged or extended dives.