So, I'll make an attempt to describe what takes place
. More for humor than anything.
1. Freshwater Inlet diverts water into either the tank or the RV
2. If going to tank, then the outlet and inline line are simply reversed and water is forced into the tank through a single hose.
3. If going to the RV, the water is diverted to 4 additional pipes that back up to the pump (assuming the check valve in the pump works), the other pipes go to the RV plumbing through 1 hose, the diverter valve below the water control panel, the Hot Water Heater, and another for the outside Shower (also at the control panel).
4. The pipe that from FROM the pump is directed from the 3-position ball valve to the left which diverts water either from the pump or directly from the water inlet. Either way, the System Use and the City Water connection both allow water to be used from the City Water connection when connected. This apparently is by design
5. The hot water pipe has 3 outlets to accept incoming water from the pump, feed the RV, and the Shower (including panel low point)
6. The freshwater Inlet line has a junction to allow the connection of a whole RV water filter system.
1/2 of the piping is PEX, the other Half is Camco FWH (Fresh Water Hose) braded lines.
The ID (Inner Diameter) is 1/2" on all hoses
All pumping connections are made using Cinch connections 1/2"