Drop in equivalent to Prince WPA10A4R hydraulic gear pump. .61 cubic inch displacement per revolution. 4.75 GPM @ 1800 RPM. 3650 PSI maximum operating pressure. 2000 RPM rated speed, 3600 RPM maximum speed. SAE A two bolt flange mount. #12 SAE inlet port with #10 SAE outlet port. 3/4" diameter keyed shaft. Right hand rotation (clockwise). Aluminum housing.