Tony,
I still draw the water through the blue plastic pipe, the 22mm copper over the outside is only to keep the pipe straight.
Peter,
If your query is where to get the threaded end to fit the pipe to the caravan, I can only suggest an American RV stockist or a Marine stockist, as the inlet is a "City Water Inlet" which is made in the USA for their RV's (camper vans!) and used on boats. I think the thread is a 3/4" male BSP.