Why Water Line Connected to Sink Trap?
While traveling in California, I noticed in the bathroom of my hotel that a water line came out of the wall (with no valve) and was connected to the P trap under the sink. This was the same type of supply line used for the hot and cold water service. The trap was made of metal. Please see attached photo.
I am unable to come up with a function for such a supply line between the wall and the trap, and I have been unable to find anyone who knows the function around where I live.
Does anyone know what this line would be for?