 is we're doing the same thing though. We're looking for the flow of air or gas in this particular instance. Yes. Because maybe you call me and you're like, hey man, we got a sewer smell in our house. Yes. And I show up, I look at the obvious things, but I'm like, hmm, this is interesting. You know, I thought maybe you had a dry pee trap or something. Right. But I can't find it. Next thing we do is we're going to do a smoke test where we fill the,