Ivation Dry Snorkel - Snorkeling with Purge Valve, Flexible Mouthpiece & Quick-Release Removable Mask Strap Clip - for Swimming, Diving, Snorkeling Premium Snorkel Features Flexible Silicone Mouthpiece for Comfort & Durability Full Dry Top Prevents Salt Water from Entering Snorkel  Even When Submerged Quick-Release Removable Strap Clip Secures to Diving & Snorkeling Facemasks Lower Purge (Blow) Valve Enables Quick Expelling of Any Water from Inside Tube Innovative Pivoting Top Self-Closes Upon Submersion & Reopens Upon Surfacing Premium Snorkel Features Flexible Silicone Mouthpiece for Comfort &amp; Durability Full Dry Top Prevents Salt Water from Entering Snorkel - Even When Submerged Quick-Release Removable Strap Clip Secures to Diving &amp; Snorkeling Facemasks Lower Purge (Blow) Valve Enables Quick Expelling of Any Water from Inside Tube Innovative Pivoting Top Self-Closes Upon Submersion &amp; Reopens Upon Surfacing