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(OldScrawn) wrote in message ...
I agree with Andrew but suspect in this case the right option would be to lose
the accessible bit of iron and replace with plastic. Probably start with an
angle grinder. I've used the little slitting wheels on "dremel" type tools to
slit the remains of the inner tube without threatening the socket, or just to
put in a stress raiser so that it cracks without applying too much force.

Thanks for that. A further question.

I don't think the cast iron pipe is 4". I appears to have an external
diameter very similar to the internal diamaeter of the 110mm plastic
pipe.

Whats the best way to make the connection? Perhaps I need an adaptor
that will smoothly reduce the 110, and fit internally to the cast iron
pipe? or can I just slip the plastic pipe over the cast iron stub and
seal it up?

Also, is the cast iron likely to be a 3.5" internal diameter? Its
marked with a "C" if that is of any use!

Thanks,

Alasdair