The Atomic Aquatics SV2 Semi Dry Snorkel SV2 combines the Scupper Valve lower section with the sleek looking Semi Dry top with horizontal vents that diffuse splashed water that would normally freely enter the top. The small gaps between the vanes of the vent restrict water speed and droplet size and permits most of the splashed water to exit the special vents. Includes Quick Disconnect keeper, sliding snorkel keeper and rotating mouthpiece.