The building's PLUMBING.
The Big Bang Theory Season 4, Episode 18
...suggest that Leonard is humorously
mocking your efforts in space PLUMBING.
The Big Bang Theory Season 2, Episode 22
You said the casita has PLUMBING?
Breaking Bad Season 4, Episode 3
I'm quite familiar
with PLUMBING.
The Big Bang Theory Season 7, Episode 2
and not pick up a few things
about PLUMBING.
The Big Bang Theory Season 10, Episode 4