Plumbing lines water in?

[travis90]

I’m working on getting new plumbing fixtures to connect to a water source. I don’t fully understand on the plumbing works on my newly acquired ‘57 Caravanner.

Why would there be two pieces for water to enter the airstream (note: both are direct to use for sink shower toilet. There is a separate spot to fill the water tank). Or are these stain lines?? If they are drain then I don’t know where water hook ups are.

Also what kind of adapter or fixture do I need to be able to hook up to water?

I can’t use the original because as you can see in the photo it’s bent pretty bad.

[AlinCal]

I have no vintage experience, but those two fittings you show are flair fittings on copper tube and normally used for gas piping.

[HiHoAgRV]

Those both look like drains. 60 years of owner mods make the original plans almost impossible to decipher. Consider new PEX.