Comment by infecto
US based plumbing. You are imagining things. Most/all resi toilets in the US use a flex hose to connect the toilet to your water supply. Its usually a threaded connection. All these style of bidets simply have a T off of this connection.
Not in the US. The pipe just goes straight into the toilet. When googling around seeing articles about installing Tushy when you have rigid pipes they are still much more flexible than mine, with separate parts you can disconnect and replace.