[snip]
But now that we know that are from Oz we can ignore you.
[snip]
But now that we know that are from Oz we can ignore you.
I know you've answered your own question now but for future reference for whom it may concern I've several times found myself trying to join nominally 21.5mm[1] overflow waste pipe & fittings & found some makes give a very sloppy fit which solvent cement doesn't fill. Sticks Like Sh*t [2] or Stixall do a good job of joining these: these are more adhesive/ sealants than plain sealants like silicones.
[1] sic: not old size & new [2] which seems to be called just "Sticks Like" nowHomeOwnersHub website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.