"neilsanner" ...
neilsanner:
Hi,

The old main valve of my house doesn't stop the water flow very
tightly when shut off. I need to install a new main valve. It's on
3/4" copper pipe. I'll install the new valve just over the old one.
The problem is that the old pipe is now more oval in shape than round
and I'm afraid that the joint will leak. I planned to use a
compression fitting, since the old valve, when closed, lets pass
enough water to prevent us using soldering.

Is there a way to get the pipe round again?

Best regards,NeilSanner

Thanks to all!!! Really!!! You guys are very helpful and very
knowledgeable persons.

Best regards,
NeilSanner

So what did you end up doing?