The 14mm GRAV® Adjustable Downstem can extend anywhere from 4" to 6" and is compatible with any 14mm beaker or straight-based with an angled. The two halves of the downstem are held together by a custom fitted segment of heat shrink tubing. Its tri-cut showerhead diffuses smoke through water, and its adjustable length is perfect for any amount of water. GRAV Labs 14mm Adjustable Downstem Slide w/ Silicone Grommet IN HAND SHIPS ASAP! FREE SHIPPING Buy with confidence check my feedback Questions? Feel free to message me