...but it's nice to know
everything's okay with your PLUMBING.
The Big Bang Theory Season 4, Episode 18
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
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