A replacement heat exchanger plate.
The 9Barista machine comes with one of these as standard. The plate is needed if you want to use 9Barista on some domestic gas cookers, or an induction cooker.
The plate is made from three layers (stainless steel – aluminium – stainless steel), which are diffusion bonded together. It enhances heat transfer from the heat source to the machine.
The plate has a diameter of 145mm.