Today I picked up some more plumbing material, and forgot my caliper (schuifmaat in Dutch) so it was another guessing game, which I lost; there’s several sizes pipes and connectors which are almost the same diameter.

I did get the correct size to connect the toilet exhaust, but the parts I got to continue to the shower on the right were too large.

Next time I will take a piece of the pipes with me so I can fit them in the store.

The Pex line I got was correct, so the connection to the cold water supply is almost in. I still need some T connectors to finish it.