AquaLung Impulse Dry SnorkelA dry version of the world's best selling scuba diving snorkel, the redesigned Impulse Dry has a forward facing valve, which allows it to close quicker than any other dry dive snorkel. We've updated it with a barrel shape for better streamlining and a push button connector for attaching to your mask strap. Features: Fast Valve Response. Our patented Impulse Dry valve faces forward so that it closes faster. This prevents water from entering and