Bodo's inventive stainless steel heat controller. You can smoke on two 25 mm coals and reduce the amount of coal you need to use for a full smoking session by 30–50% thanks to the innovative ventilation system, which prevents the coals from going out and maximises heat transfer.
The instructions included and shown in the images give details for the 4 heat levels and how to manage your bowl.
This Bodo 2 coals HMD will work on all HMD compatible bowls.