This is a hose for connecting the Merci Pot and the Shu Pot Nasal Mucus Catcher. It was too long and difficult to use, so we are selling a set of 2, cut to approximately 4cm, including a spare. As shown in the first photo, you can use it immediately by simply inserting it into the "narrow insertion port of the Shu Pot Nasal Mucus Catcher" and the "genuine hose of the Merci Pot." You can also use it at its original length, but it was easier to use without bending if you cut it with scissors to match the length of the insertion port on the catcher side. (See photo 2) It's made of a material similar to the Merci Pot hose, and they stick together, so once you insert it, it won't come off easily. *This is a sale of "2 hoses of approximately 4cm." The Shu Pot Nasal Mucus Catcher and Merci Pot are not included.