Don’t Ignore the Gurgle: What Water Hammer from Closed Valves Is Trying to Tell You

https://dlf-ne.org/why-your-house-smells-like-sewage-and-what-to-do-about-it-straightforward-tests-and-fixes/

That soft gurgle behind a wall, in a radiator or under a sink is easy to write off as harmless plumbing noise. It isn’t