How big a pipe? Small pipe, rent or buy a hammer drill. Bigger pipe,
same hammer drill, and drill a circle of holes, and crunch out the
middle, or rent a hole saw. Really big hole, hire it out. I paid about
$300 to have a duct-size hole punched through mine. (in a spot where the
load above was not an issue.)
Usual caveats about not creating water paths through the wall apply.
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