The 14mm GRAV® Fission Downstem is compatible with any 14mm beaker or straight-based water pipe with an angled joint. Its fission holes diffuse smoke through water and are made with a tungsten rod while the glass is hot, creating smooth edges that reduce clogging. This downstem measures 4.5" in length. It fits into a 19mm joint and receives a 14mm bowl or banger.