THIS IS A 65CM (4 CI) HYDRAULIC PUMP. IT HAS A 1 3/8" INLET PORT ON MOUNTING FLANGE LEFT SIDE , A 1 5/8" INLET PORT ON MOUNTING FLANGE RIGHT SIDE, A 1 1/16" PRESSURE PORT IN PUMP BODY ON RIGHT SIDE, A 7/8" COOLER RETURN PORT ON TOP AND A 3/8" DRAIN PORT ON BOTTOM. THE SIDES OF THE PUMP NOTED ARE AS SEEN FROM THE TRACTOR SEAT