In message , Andrew Gabriel
writes

If you have a ribbed rubber seal that maybe isn't sealing quite as
well as it did when new, as you pull it out, each ridge flicks ****
in your face as it pops out of the pipe...

Luckily, this particular WC has not been used for several years, and the
pipe was clean. the connector popped out fairly easily and a new ribbed
rubber stopper went in with a little help from my foot. The floor is
tiled (vinyl), and by trimming the tiles, the stopper is flush with the
floor. Job done!

Next job is removal of the adjacent basin, but that is far more scary,
with two 'live' water pipes and no convenient stop cocks.

--
Graeme