"Gear-type, heavy-duty pump is designed for PTO drive operation on tractors of all sizes. No additional gearing is required. These pumps feature self-adjusting wear plates that seal off leakage and offset any wear or expansion that may occur during the life of the pump. High tensile aluminum housing, minimum gear clearance, cast iron endplates. Internal splined shafts go all the way through and are supported on both sides by roller bearings. All models have a #16 SAE inlet port and two #12 SAE outlet ports. Include #12 SAE to 3/4in. NPTF female adapter. Reservoir size should at least be as large as the output of the pump. Rotations Per Minute 1,000, Shaft Diameter in. 1 3/8, Material Aluminum, cast iron, GPM 23, Weight lbs. 36, Max. PSI 2,000, Shaft Type Spline 21-tooth. GPM 23 RPM 1000 Diameter/Spline 1 3/8in. / 21-Spline"