The perfect snorkel for scuba diving, designed with and oval-shaped bored tube that has been combined with a lower section flex tube that drops away when you start using your regulator. The splash-proof dry guard is as good as it's gets, it virtually eliminates water from entering the tube, meaning less interference as you snorkel. In the case that water does make its way through, the Apollo SV has one way purge valve system so it can easily be blown out.