Plumbing success and questions

[Lothlorian]

I have been plumbing my trailer by using pictures somebody else posted. My first attempt in real life plumbing except the sink and toilet in my house. Check out my work and I have some questions.

All the copper is gone in my trailer. When I got the trailer much was already taken out and only bits and pieces were left. Check out my pics under the sink in the kitchen. Who ever had the trailer before me cut hoses and removed hoses. I do not know where they go. I do have my freshwater tank and hoses are attached to the tank but the other end of the hoses have been removed from their fittings. I hope the picture can shed light on my challenge.

Today by reading plumbing on airstream forums I realized I need an pressure valve. I guess I will by one. I also noticed in the pictures I downloaded there is an existing pressure valve in that trailer I am using as an example. Any advice?

Check out pics. I have tried to read the schematics but I am more of a hands on visual learner who does better by someone showing me or photos.

Anybody in the Loganville Georgia area who I can contract to help me finsih the plumbing?

SIU Bound

Brian