Hydraulic Impact Wrench w/QC Adapter Product Type Impact Wrench with Quick Change Adapter Drive Size 1/2 in Square Fastening Torque 400 ft-lb Pressure Port 3/4 in - 16 SAE O-Ring Return Port 3/4 in - 16 SAE O-Ring Minimum Operating Pressure 1 000 psi Maximum Operating Pressure 2 000 psi Minimum Flow Rate 4 gpm Maximum Flow Rate 10 gpm Includes Heavy Duty 1/2 in Square Drive Adapter Actuation Trigger Drive Style Standard Drive Type Standard Handle Type Pistol Grip