LPR hose always goes to the center hole. On a hinge frame, the hose from the back of the ram goes to the back of the three way, and the hose from the front of the ram goes to the front of the three way. On a slider frame, the two ram hoses are reversed from the configuration I just described (front of ram to back of three way, back of ram to front of three way). One of the imutable laws of autocockers, everybody who owns one should know that.