Specialised in hookah spare parts, Darnashop has downstems for your DUD hookah. These stems are equipped with a diffuser. Watch out, there is many models. Be sure to correctly choose the downstem that fits your hookah.
Choose an 02820 downstem if you have a FatBoy model, choose a 02821 if you have a Shooting Star, Pyramid, or Firestarter model.