The glass downstem is designed to fit into the glass hookah bowl and is an integral part of the Fumo bowl and downstem system. The downstem inserts into and through the bowl to complete the interconnection. Once placed in the hookah the bottom portion of the downstem should extend about 0.5″ – 1.0″ inch into the water in order to make the hookah function properly. The downstem consists of an integral diffuser bottom, glass ground joint and a funnel bowl spire. The diffuser end is designed to reduce noise and increase cooling of the smoke. The glass ground joint provides a tight seal between the bowl and the downstem.