I think this is the "christmas tree" type valve, as you can (maybe) tell from the pictures. It does not bolt on to a separate bracket, but instead threads into a pipe, which then threads to an elbow that tees into the filler neck.
There are indeed four ports, the one in the front of the valve is capped. I don't know if it's pressure or return. The pressure from the main comes in at the left side of the 'tree', the lift pressure goes out from the upper of the two rear ports, and the 'return' is on the lower of the two rear ports.
Once I replace the front tire I had patched, I'll start it up and try it with the main lever held all the way out, and push and pull the remote lever. I may have to remove the mowing deck to figure out if it's actually powering down or if it's still just gravity down, but I got the impression from one of the other responses that the remote ('christmas tree') valve is double-action, not single. Provided the PO plumbed it right, that'll be great.
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