Hydraulic 16GPM Two 2 Stage Gear Pump. Model GP-CBN is a HI/LO Hydraulic Gear Pump with 12 displacement combinations with maximum pressure of 900 psi for the low pressure and 3000 psi for the high pressure pump. The change from LO to HI pressure is automatic with the LO side pressure pre set from 400 psi to 900 psi. The HI/LO pump is all cast iron. Application for the HI/LO pump are log splitters, pressure etc. Where rapid movement for the cylinder at low pressure is required prior to automatically switching to the high pressure mode to meet load requirements. All Cast Iron ...