 Gary: The plugs are the ones you would remove to hook up a remote cylinder. In the process, you would loose a fair amount of oil unless you were quick ! In the picture they are the two on the right side of the box, pointed aft, one atop the other. You can see I have one plug that has a screw on cap removed. That is a AA5724R selectable valve, but more on that later. Clooney had a neat diagram of the plugs and how they work, but basically the ones that are smooth (or blocked) on the outside end (no pipe plugs or hoses), have a passage that routes the oil in to their sides, and out their front. The ones for the cylinder have pipe thread openings to the rear for hose connection, and let the oil in the side and out the back and to the hydraulic hoses. The AA5724 R selectable control valve that I have pictured was offered as an option when you wanted to install break-away couplings via the two rubber hydraulic hoses that exit out the right hand side of the box and wrap around under the battery box. You would turn in that small interal metering screw that is found under the removable cap, one way for rockshaft operation and the other way for remote cylinder ops. That way you wouldn't have change plugs and lose oil each time you connected the cylinder or loader. Now you might well have a selectable plug. It was a very popular option on the early numbered series, and many were sold over the counter and retro-fitted on "A/B/G" models, too. Frank
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