The Scubapro Spectra Dry Snorkel is one of the best functioning snorkels that you will find.

It has a special dry top which closes once submerged in water so you don't get water down the tube of the snorkel.  If you do get some water inside the snorkel then it also features a purge valve at the very base of the snorkel for easy clearing.  

Snorkel Features:

• Dry top design

• Large bore tube

• Flexible corrugated joint for comfort and to stop jaw fatigue.

•Regulator style mouthpiece

• Purge valve at lowest point for easy clearing