Viga Siphon spare pipe

Somehow, my plumber lost the siphon pipe and didn’t put this into the space where this should be. Of course he didn’t tell me something.
The result was a harsh smell out of the drain. I build this to fix it. You need only a large O-ring but it works also without.

Original Part:
https://www.viega.de/de/produkte/Katalog/Entwaesserungstechnik/Ersatzteile-fuer-Advantix-Systeme-und/Advantix-Ablaeufe/Badablaeufe-Systemmass-100/Advantix-Tauchrohr-4935-21.html