The Weed-Star diffuser plug connects 14/5er downtubes with 14/5er bongs and gets you a more cooled and soft smoke. That's because of the many little drilled hoiles in the diffusors tip, that divide the smoke in many small bubbles.
Length from the core's upper edge: ca. 13.5cm
Tube diameter: ca. 8mm
Diffuser holes: drilled and melted