Brand New Dry Snorkel for Easy Breathing Use for Snorkeling, Free Diving, Lung Diving & Swimming! Top Stop Valve & Silicone Mouthpiece DRY TOP SNORKEL Snaps for easy attachment of the mask Soft silicone mouthpiece Bellows for different face shapes One-way quick drain valve Free storage mesh bag Top dry automatic water stop valve Top is below the water surface, & the water stop valve is closed to prevent water from entering the snorkel Tp is above the water surface, the water stop valve is open, the air enters, & the breathing is normal Enlarged ventilation holes allow more air to enter, making breathing easier & preventing dizziness. D1