Hydraulic Ports: Power Source Side - Pressure:1-1/16 IN - 12 SAE O-Ring, Power Source Side - Return: 1-1/16 IN - 12 SAE O-Ring, Tool Side - Pressure: 3/4 IN - 16 SAEO-Ring Boss HTMA Flush Face Coupling, Tool Side - Return: 3/4 IN - 16 SAE O-Ring Boss HTMA