Pumps specially designed cylinder heads are reinforced to withstand the demands of high pressure spraying. Model #5321C-H delivers up to 2.2 GPM at 1000 PSI. Has a 5/8in. I.D. hollow shaft. Can be driven at motor speeds up to 1800 RPM. Steel base fits a 56 frame motor; only 1.5 HP required. Pump handles water temps up to 180°F. Unitized valve assemblies have stainless steel seat, spring and poppets for long life. Torque arm furnished. Pressure-tested cast iron housing. 1/2in. NPT inlet and outlet ports. 1-year limited warranty