There are 4 versions:

1. Platte (standardversion NO Insert needed, for PLA/ABS etc.)
2. Platte PTFE (standardversion with PTFE insert TPU/PLA/ABS etc.)
3. Platte + Kabel (with Kabelhalterung on the side. NO Insert needed, PLA/ABS etc.)
4. Platte PTFE+Kabel (with PTFE insert. with Kabelhalterung on the side. TPU/PLA/ABS etc.)

i adjusted the Hole height so its perfectly aligned. So this one is better then the Stock one even when you don´t print with TPU.
You will see how easy you can put in your new Filament
I use Option 4. chause you can use it for all

You need a piece of PTFE Tube with outer dia 4mm.
maybe you need to widenup the hole for the PTFE tube. Use a round file and make the Tube a tight fit.

1. Screw in the PTFE Tube connector.
2. Put the PTFE Tube all the way in on the feeding side!! till it hits the ending of the connector. don´t put in the side of the connector.
3. Cut the PTFE Tube along the radius of the Part. i used a very sharp cutter.
4. Screw the Part on your printer and check if the PTFE tube doesn´t touch the Extruder gear.