Stayed in a hotel recently - the shower hose connectors at both ends leaked
badly. They were a mess of sealant and PTFE tape.

I reported it to the reception. She said the "plumber" had recently fixed
it - and she would call him back!

Presumably he doesn't know that a rubber washer is needed and the thread is
merely for providing a clamping force. I wondered if he really considered
himself to be a "plumber"?