You don't need to be an 'investor' to invest in Singletrack: 6 days left: 95% of target - Find out more
I've got a Grohe sink, and the waste pipe has started leaking. Turns out that's because it's peppered with holes. Classy. I've managed to bodge it for now by spinning the pipe upside down (so the holes point upwards) and I'll wrap it in self amalgamating tape when I find some.
Obviously this is not a long term solution.
If it was a normal fitting I'd just slot in some new plastic pipe, but of course it's not. The wall end is fine, it fits a standard 34mm fitting but the trap end tapers down (see pic).
Any idea where I might be able to find something like this? Searching for Grohe spares hasn't thrown anything up.
A Halfords light? I'm confused. Image doesn't seem to work, sorry - try again...

Probably best to have a look at the German websites seing as it's a German company. Put in a search for 'Grohe Siphon für Waschtisch' and you should see a few websites that you can try. If you have a product number it will be even easier.
One of the sub parts of this I guess then:
GROHE | Zubehör - Geruchsverschluss | für Waschbecken, 1 1/4" | 28947000 https://amzn.eu/bD8ERi8
When I needed a replacement part for my Grohe shower and couldn't find any stockists (old model so those that listed it were out of stock) I just emailed their customer service asking if I could buy it from them and they just sent me it for free (not bad as the out of stock listings had it at £80)