IST SN201 3D FLEX DRY Snorkel WITH 360° Swivel For Scuba Diving or Snorkeling
3D FLEX DRY's special top has not 1 but 4 valves.    Each valve is capable of blocking the air entrance independently.    If the snorkeler unintentionally submerges the top part of the snorkel a conventional dry snorkel will have its only air passage closed off completely as soon as it senses buoyancy change but in the same situation with a SN201 snorkel, only the valves that are underwater will shut while the others will remain open, providing unobstructed breathing path.    Apart from the special quad-valved dry top and double-jointed bottom section, SN201 is also equipped with a large purge valve and swiveling snorkel keeper.    User comfort is guaranteed with 2 patented 360 swivel joints ball-joint style connections can be found just below the mouthpiece and the purge body.    Both can be freely rotated to suit each individual's facial profile and mask set-up preferences, whereas a traditional "stiff" tube has very few or no ways of making adjustments, resulting in discomfort and reduced snorkeling enjoyment.