Cressi-sub’s snorkel for professional divers, particularly suitable for use with self-breathing apparatus. The tube, without flexible joint, is securely mounted on the mouthpiece holder with several grooves and O-rings: this is a useful feature particularly during ascent with self-breathing apparatus and when the snorkel is placed back into the jacket pocket. Other comfort enhancing features of this snorkel even for the most demanding professional divers are: profiled guard, elliptical tapered tube, angled mouthpiece, increased well for better drainage, larger internal elliptical valve for improved drainage.