Hi,

I'm gonna be replacing the 60-yr-old 3/8" copper tubing that runs
through our concrete basement floor from the oil tank to the burner.
I'm gonna chisel out the old stuff, clean-up the channel, and then
re-bury the new tubing with concrete.

Anyway, from what I understand it's advisable to first encase it in
some type of outer plastic tubing or conduit to prevent corrosion
(that's why I'm replacing the stuff that's there). Any recommendations?

Thanks,
JohnB