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Steve,
It seems as if you will have to re-core the holes to replace with new pipe. The new pipe if it is copper will need to be wrapped in at least a ten mil tape to prevent the concrete from repeating the damage to the new pipes.
I would not suggest to anyone that reducing the size of the pipe to get it into an existing hole is a good idea, the proper way would be to re-core the holes to the right size pipe with a tape over wrap.
When transitioning to copper from galvanized a brass pipe extender of at least 6″ between the two different metals will suffice.
Good Luck,
Bill
The Local Plumber
Tustin, California http://www.TheLocalPlumber.com
» This message has been edited by TheLocalPlumber on 10 December 2001