system
A chat on subreddit /r/NoStupidQuestions
human
Thank you so much! This was exactly the kind of answer I was hoping for!
gpt
To follow up, a lot of commercial restrooms in the US use flush valves.  They are much stronger than a typical residential toilet.  You can tell it's a flush valve when there is no tank on top.  It's just a large pipe going to the toilet.