In short: the whole thing was porous. But throw the irrigator I did not so. While ordering the complete handle in brown new is possible, but quite expensive and it was only the hose breaks. In my search I came across this tubing here.
The delivery is out of the tube for a little guidance. The istleider without pictures, but reasonably speaking and mainly correct. I had during installation a few minor difficulties (who the hell came to the glorious idea to build in Torx screws in an oral irrigator ?!), but ultimately the unit working again.
Conclusion: you can see it from that the optics of the tube (it is blue instead of white and non-spiral) does not quite fit that part is the perfect solution to a destiny of the device on the electronic waste still postpone. For every halfway talented hobbyist (with Torx) the perfect solution, 5 stars for it.