Log Splitter Hydraulic 13 Gpm Pump 2 Stage 3000 Psi Hyd Log Splitter Pump Aluminum Construction 4-Hole Bolt Pattern Fast Cycle & Low Noise Higher Pressure Rating Enhance Power Force Wide Application Shaft Extension: 1.5',Outlet Port: 1/2' NPT,Construction: Extrusion Aluminum,Max. Operation Pressure: 3000PSI,Inlet Port: 1.0' Diameter Tube,Gross Weight: 6.36 kg (14 lbs),Max. Operation Speed: 3600RPM,GPM: 13,Stages: 2,Shaft Diameter: 1/2',Keyed Shaft: 1/8' Square,Bolt Pattern: 4 Bolts On 2' x 2' Square (See listing photo)