Hello At the filling nozzle of the fresh water tank the locking for the tank cover went out. (see pictures) As I see this was a press fit because nothing is broken and no adhesive can be seen. With what can I glue the ring back in again? Have only UHU and Pattex in the house. Food-safe the adhesive does not have to be, since this tank is no longer filled. I thank you in advance for your answers.