features corrugated silicone hose, replaceable silicone mouthpiece and one way purge valveFeatures:Floating ball closes the entry while submerged and reopens when the top is overwater.Corrugated silicone hose for convenient application.Dry top design to minimize the water entry.One-way purge valve allows easy water clearing.Replaceable angled mouthpiece for comfort fit.Soft silicone mouthpiece reduce jaw fatigue.One-handed quick release clip to connect or disconnect you mask. Y4301B