I have 2 large Chiltons 71 and 72-79 a Haynes and a Motors vacuum and wiring. I have looked in the service manuals shown on the board here
I have yet to find a diagram where it shows the entire vacuum hose configurations for my 71 duster 318. I have found partial diagrams and sections here and there. but nothing complete. Nothing shows the reservoir and water shut off. The only water shut off I have found has 2 lines (in /out) but mine only has one connector.