This adapter makes your Nextruder compatible with any V6 nozzle. You can use it on your Original Prusa XL and MK4. In case you want to use your V6 nozzle on the Nextruder, install it together with this nozzle adapter.
*V6 nozzle(PRT-CB0011) is not included
To replace your Nozzle E3D V6 adapter please consult the assembly manual: https://help.prusa3d.com/guide/how-to-replace-the-prusa-nozzle-mk4-mk3-9_421215