Those are the entire gasifiers
Missing is the lightning port and the gasoutlet, to be welded in today.
They are 120 cm tall, where as 60 cm, on the lower part, is the layer to maintain.
The total lenght is to keep the gas cool on outlet so i can use plastic as before.
The higher 60 cm is the refill zone, containing , for the 4" , 1,3 kg Charcoal, for the 6" it holds 2 Kg
Those gasifiers are meant to be used for the cooking stoves / teaching how to gasify...
its cheap, affordable and they always work.