This is to stop the Bowden tube being pulled down in to the Creality Space PI while it's printing. The allows the PTFE tube to be passed in at the top and pass through inside the Pace PI and provide a cleaner smoother path for the filament. Using the PC4-M10 Pneumatic Connector Fitting for the PTFE tube is allows it to be locked in place and stop it being pulled down in to the Space PI dryer. The connector at the top cuts it's own threads as it's screwed in.
This also work with Axis Space Pi Silicon Dry box installed as well: https://www.printables.com/model/886781-creality-space-pi-desiccant-box
The author marked this model as their own original creation.