General Pump PULSAR4KHP Unloader 3/8" NPT threads. Can use with many pressure washers. Reference your manual for detailed information. PART NUMBER PULSAR4KLP PULSAR4KHP Maximum Volume 10.5 GPM Rated Pressure 2300 PSI 4050PSI Maximum Pressure 2600 PSI 4500 PSI Maximum Temperature 195° Note: The valve has been designed for continuous use at a water temperature of 140° F. It can operate for short periods at a maximum temperature of 195° F. Port Size Inlet (2) 3/8” NPT-F Outlet 3/8” NPT-F Bypass (2) 3/8” NPT-F Overall Dimension 7.51” x 3.25” x 1.97” Weight 1.5 Lbs. Reference your machines manual for before ordering.