Hydraulic Gear Pump - 16 GPM, 2-Stage (Brand New) Stages: 2, Clockwise direction Max. Operation Speed: 3600RPM, Max. Operation Pressure: 3000PSI Shaft Extension: 1-1/2", Shaft Diameter: 1/2" Keyed Shaft:1/8" Squarex. 0", Inlet Port: 1.0" Diameter Tube Outlet Port: 1/2" NPT