This is the Deep See Airstream Snorkel with Purge Valve and Silicone Mouthpiece Features: Soft silicone mouthpieces are replaceable Substantial bite tabs Clip style snorkel keeper for convenient mask strap attachment Easy clearing purge valve Designed to fit adults This snorkel features a hypo-allergenic soft silicone mouthpiece with substantial bite tabs. It includes a clip style snorkel keeper for convenient mask strap attachment and a reflective top for visibility. Available with or without an easy clearing purge valve. Designed to fit adults.