A basic snorkel consists of a curved tube with a mouthpiece. This is called a "J" snorkel, and an example is pictured to the left. Another common design is a flex snorkel. These snorkels allow the mouthpiece to hang away from the face while not in use.

A popular feature is a purge valve located below the mouthpiece. The purge valve allows water to drain through the bottom of the snorkel, which makes it easier to clear water from the snorkel.