[culebron21]

That's why I do all DIY myself, incliding plumbing or electrics. Craftsmen cost money and they try to finish in one session, so they do lots of compromises.

Examples: under a sink, there were two 2m-long supply hoses, where 40cm would be enough, convoluted in a double loop together, to spare a visit to a DIY store. Or dowels made to be driven by hammer, for plastic baseboards, used to hang a cupboard (almost fell out). Or a too long corrugated plastic tube making a virage and another, unnecessary, water seal, and impeding outflux -- also to spare a visit to a store.