The FEDDEM Extension unit (e.g. 10 L/D long) allows for easy modification of an extruder´s length to match the requirements of an individual process. Changing the processing lengths just takes a few hours. This offers the option of adapting the processing length of an extruder from a compounding application to large-volume venting / degeassing or to reactive processing. Subsequent retrofitting of FEDDEM extruders to a longer processing length is an option and entails substaintially lower investment costs compared to sourcing an additional extruder.