This adapter fits your 10mm water pipe. It is to be used to turn your 14mm female rig to a 10mm. You can take your 14mm female jointed pipe and transform it into a 10mm dab rig, or you can take your 10mm male jointed water pipe and turn it into a 14mm male jointed vapor rig. This glass adapter allows you to dab your legal concentrates and essential oils out of your favorite water pipe!