The  UNIDIVE 7706 Snorkel is an open top barrel. Snorkel

If water does get into the snorkel there's an underside purge valve that lets water drain out of the barrel without entering the air intake chamber of the mouthpiece.

Moveable Snorkel Clip for attaching Snorkel to Mask

Features:

• Large capacity drain chamber for easy clearing.
• Ortho-consciously designed mouthpiece for  comfort.
• Crystal silicone flexible neck
• Attached Snorkel clip
  
• Colours:  Black, Blue, Yellow,  Green and Silver