This J-Hook adapter is an awesome accessory that gives you multiple options on how to use it. The j-hook is a curved piece of clear glass with a mouthpiece on one side and either a 14mm or 18mm female joint at the other end. Put a male bowl in the joint to turn it into a hand pipe, attach an ashcatcher to the joint to create a bubbler, or throw a domeless nail on it to make it a small dab rig. No matter how you decide to utilize this glass accessory, it is a functional and useful adapter that gives you the choice of how to smoke. It features a flared and rounded mouthpiece.