I recently purchased 2003 Coleman Laramie pop up. The trailer needs a lot of work and i am doing the plumbing next. the plumbing is a mess. there are no connections to the sink and broken pipes under the trailer. I cant figure out the puzzle pieces to to complete the system. I am going to be replacing the plumbing with PEX. I am confused on the correct way to route the piping. I found the water pump next to the outdoor shower and wheel well & found a extra hole next to the hot and cold. I tried doing some re search and most pumps were directly after the water tank. If anyone has knowledge to help me i would appreciate a explanation. Not sure if the previous owner capped it to only use city water? below are some pics and a diagram i made.