Pete Verdon wrote:

In my opinion the final result should be a solvent-weld joint. Made
properly (and it's not especially hard) this will be permanent, robust,
and neat.

I'd agree with that. I recently discovered the major contributor to a damp
problem in our kitchen was a leaking push fit waste elbow with the joint
embedded in the mortar just below the outside surface of the wall.

--
Mike Clarke