Description 4-roller design, Max Pressure: 150 PSI (10.5 bar), Max Recommended Temperature: 140ÂF (60ÂC), Port Size: 3/4â NPT (female), Mounting: Base Mounted: 5/16 -18 UNC-2B (2 holes), PTO: Use torque bar and chain, Shaft: Size: 4900: 5/8â solid shaft 4901: 1/2â.