Because I don’t have the correct thread of the pushfit, I’ve created this adapter. It takes a PC4-M10 pushfit (like the one on the china E3D bowden version) and screwed on a M6 thread of the MK7 (MK8?) extruder.
I don’t know, if it will be strong enough. The weakest point is between the M6 thread and the M10 section. For the long term, you should grab one of these fittings: https://goo.gl/K0rPgI
Download this 3D Model on: https://www.thingiverse.com/thing:2208165