Sterilizers are classified into two types — vertical and horizontal ones. Whilst most of the millers are familiar with the horizontal sterilizers, they will have to be contented with the pictures of the vertical ones as there are no vertical operating units in Malaysia. The vertical sterilizers with capacities ranging from a few hundred kilogrammes to 5 t are filled up directly or sometimes receive a basket loaded with bunches. Most of the young palm oil mill engineers in Malaysia probably never had a chance to actually see a vertical sterilizer. The same applies to the hydraulic presses that have virtually vanished from Malaysia.