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 pack includes ten downstems in assorted lengths. They fit into a 19mm joint and receive a 14mm bowl or banger.