1 x Genuine Wanhao extruder top plate. This hard black plastic top plate/cover which sits on top of your extruders. This top cover has the cut-out required to fit MK9 extruder/extruder feeder systems already cut into it. This is worth buying if you are upgrading to the MK9 feeder kit and do not wish to modify your existing plate. For all Duplicator 4 printers.