Promate Mariner Whistle Snorkel SK500 - Professional Safety Snorkel with Whistle for Scuba Diving, Swimming & Water Sports | Emergency Signaling Device for Boating, Kayaking & Marine Activities

*Elliptical open top and contoured barrel reduces water resistance.
*Quick slip-in snorkel keeper.
*Built-in whistle housing.
*Flexible silicone corrugated lower section.
*Soft silicone mouthpiece prevents jaw fatigue.
*Silicone purge valve for easy draining.