NEW Diffuser for Hookah Shisha Nargila Smooth Bubbles for Downstem (2 Diffusers) Our diffuser attaches to the bottom of your downstem and makes the draw on your hookah even easier. Instead of your water bubbling on each hit the diffuser smoothes everything out, for quieter, calmer hookah sessions. It comes with 2 diffusers one a small diffuser and one large diffuser.