- The extraction bench allows to introduce and to remove the endoscope from the furnace. This safety device ensures the automatic removal of the endoscope in case of dysfunction of the cooling systems. Thanks to a filter with automatic drain and a pressure reducing valve, it filters and regulates the air pressure in order to avoid the dust particles in the endoscope. The thermometer, the flowmeter and the thermo switch allow the display and the control of the temperature of the water and the water flow.