The author remixed this model.
I do not have PETG and i use lot of ABS.
In ABS the original model broken when i mount the threated ring. The ABS is not enouth flexible.
I propose these functionnal solution if you dont have PETG in your stock.
The conncetor is in two parts with threads.

You must mount the Ring before screw the tow parts.
You also need glue the thread to fix the tow parts.

Below the Valve mounted :
