Aqualung Impulse Classic Flex

KEEPS WATER OUT, the Impulse has two valves:
if a wave breaks over the snorkel, the upper valve
directs most of the water out before it reaches
the mouthpiece. But if water does get past the first
valve, it will drain out through the lower valve.
? CLEARS EASILY, in the unlikely event that you
would need to clear the reservoir below the
mouthpiece, all it takes is a gentle puff of breath.
? The flex section allows for easy positioning
and will drop away when not in use.