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11 GPM 2 stage gear pump, and 25 GPM single spool valve. This is an excellent combination to power your log splitter. 11 GPM Pump specifications Pumps work in horizontal and vertical positions Log Splitter Pump Spec Sheet 11-28GPM Spec Sheet: GPM: 11 Shaft Diameter: 1/2in. Inlet: 3/4in Outlet: 1/2in. NPT Dimensions: 5.5in. x 3in. x 4in. Minimum engine size: HP: 5 Recommended operating RPM: 3600 1st Stage: 11 GPM@650 PSI 2nd Stage: 2.9 GPM@2500 PSI Maximum Pressure: 3000 PSI Bolt Circle: 2.85in. 4 Bolt Holes Spaced 2in. on Center Bolt Hole Diameter: .344in. Rotation: Clockwise 25 GPM Hydraulic Fluid Type: AW-32 10-Weight (ISO 32) or AW-46 20-Weight (ISO 46) ***Not designed for use with “universal” or "tractor" hydraulic fluid*** Note: Suction-side filtration should be no finer than 150 micron. Use of a 10-25 micron filter on the suction side of the pump is too restrictive and will cause failure. Valve specifications In neutral position, both work ports blocked, pump unloads to tank Pressure rating: 2750 PSI Capacity: 25 GPM Maximum Operating Temperature: 180 ℉ Relief Valve Setting: 2250 PSI Detent Release Pressure: 1400 PSI Working Ports: 1/2 NPT In/Out ports: 3/4 NPT