I need to run copper water supply pipes through a brick wall that is 10" thick. I want to bore a large enough hole to allow for a sleeve/conduit through which the copper pipe will run. What should this sleeve be made of? The next size copper pipe, or something harder, like iron pipe?
Seems like a copper sleeve could be warped if the surrounding brick cracked or moved. If I used iron, wouldn't I need an insulator between the dissimilar metals?
Thanks for your help!