I feel like a right plonker and hoping for some help! I have a new Miele washing machine, it was plumbed into a standpipe but the standpipe was far too small (it's only around 12 cm long and is about halfway up washing machine), this is what the fitters told me. So I thought I would plumb it into a spigot below the sink with a jubilee clip and thought that would be straightforward, I bought the new sink trap with spigot from screwfix, atatched with jubilee clip and...it didn't seem to work at all, when I looked at it - the spigot appears to be below the trap exit if that makes sense - is that why it didn't work? It came like that from screwfix so maybe that's why. And then I tried to go back to how it was but it doesn't seem to drain as well as before - looking at the end of the waste pipe just inside there is a hard black bit of plastic which when you press down seems to increase the waste flow. Is this supposed to be there and have I damaged anything? Appreciate this probably doesn't make much sense but any help appreciated. All the best