This is an octopus holder that snaps onto the mouthpiece of your octopus regulator. It protects the mouthpiece from getting dirty when you're not diving, so it's useful both on land and underwater. It also securely holds your octopus regulator underwater, making it an amphibious holder. On land, you can of course use it to protect the mouthpiece of your main second stage regulator. Diving Scuba Diving Scuba Diving Underwater Gadgets Snorkeling Free Diving Skin Diving