Example of power beyond plug in a Prince valve. Some valves are different and have an adapter with o-rings to seal the high pressure from the tank circuit.
I see. That's clever - with the backhoe mounted there is probably no use for the remotes, and with the BH dismounted there is no use for the swing pump.... but when the hoe is dismounted there are these handy swing circuit connections which are lonely and unused.
But is there any advantage other than using two shorter hoses? - I'm assuming that on the M59/62 the hoses to the swing pump outlets would be closer than those to the power beyond port on the control valve.
This person used the swing cylinder circuit for his rear remotes on his L47. He made the connection and valve body removable. Looks like a good way to go.