+ Solid and gutverarbeitete plastic version
+ Clean edges and ends
+ Screw connection - (please) with hand)
+ Defect-free seals
+ Good sewage connections
The flexible part of the siphon is easy to install, it can withstand hot water without smell or stink even, and makes drip-free, safe and reliable its wastewater services.
An easy convenient and highly recommended Set!
NB:
For me the manual more than adequate, and something you should understand about the matter already, after all, is patient and takes water in ignorance quickly and paths that are now so do not want;)