This is a nasal Cannula that you can hook up to the HW1 Hydrogen Rich Water Generating Machine. It comes with an adapter so you simply unscrew the top piece on your glass bottle, screw on the adapter, then attach the Cannula. You can now breathe in hydrogen gas through the nasal cannula as you generate hydrogen water. It is a great way to get hydrogen directly into the lungs for extra benefit. Remember to only fill your glass jar about 3/4 of the way up if you are using the nasal cannula so it can make a pocket for the hydrogen to build up and escape.