Yeah - well, you may have to be more specific
![Cry laughing :cry: :cry:](/styles/default/xenforo/vbSmilies/Normal/cry.gif)
. My issue was I didn't have the core bit and didn't fancy buying it. So had to wait until my brother was available. All sorted now. I can see why the plumber wanted a grand tbh. Lots of messing around as I needed to retain the old stack temporarily (the boss has a mechanical fixing for the bath waste, which is still in use).
If you mean reducing the 110 down to 90, I had forgotten the adaptor is in the box. So I have a nice push fit 110 out of the wall, which I then tickled with the heat gun to make it wide enough to get a solid a solvent weld to a 90 degree.