Thanks to stockholmviews
I added an M10x1 connection thread with a 4.1 mm through hole. The clamping pieces have a 0.3 mm thick adhesive disk. The PTFE hose connector holds surprisingly rock solidly. The usual compressed air couplings are defective after a short time.
I printed the parts with PCTG without supports and scaled the mother to 105%, less would have worked.
The author remixed this model.
With M10x1 connection thread