House has old lead pipe water main. This needs extending (with polypipe)
to new position within kitchen extension.

Plumber says this is difficult if the old pipe isn't circular enough to
attach the connector he has in mind.

Isn't there a connector which could be soldered to the lead pipe side,
somewhat irrespective of its exact profile?

[My preference is to polypipe all the way to the water meter in the
pavement, but that involves digging up (and reinstating) rather a lot of
concrete path. As well as presumably getting the Water Company
involved.]

ps The water company previously tested the potable supply for lead, and
declared it so low it probably wasn't a lead pipe anyway. Ho Hum.
--
Roland Perry