If I'm not mistaken, one port is fluid flow from the pump and the other is return to the sump. Those ports are not active until/unless the flow control valve located just below the front of the seat is closed completely. The TPH control lever then activates the flow to the rear remote. The ram will extend under pressure and return by gravity only – there is no provision for flow to retract the ram. These remotes are usually used for dump trailers where the weight of the trailer will collapse the ram.