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General Pump PULSAR4KHPEZ Trapped Pressure Unloader with EZ Start - 10.5 GPM, 4500 PSI, 3/8 FPT

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1.60 lbs
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Now Only!
Brass housing pressure unloader with 3/8" inlet, outlet, and bypass ports. Includes an EZ Start knob for simple pressure adjustment. 4500 PSI, 10.5 GPM, 195° Fahrenheit max temperature.

Technical Specifications

Max Temperature: 195 degrees F
Inlet Port: 3/8 inch
Outlet Port: 3/8 inch
Bypass Port: 3/8 inch
Max GPM: 10.5
Max PSI: 4500

Product Description

4500 PSI Brass Unloader

The General Pump PULSAR4KHPEZ Unloader is made with brass and has an easy-start knob for fast, simple pressure adjustment. The valve regulates the maximum pressure of the system by varying the flow discharged by the bypass. The adjustment is made by altering, by means of a piston, the position of a sphere which partially closes the bypass opening. The valve is sensitive to water flow. At gun opening, the water flows through the valve which maintains the system in pressure until the gun closes, the interruption of the flow provokes the complete aperture of the bypass which allows to discharge the flow at low pressure. At gun closure, the special mechanism of zero setting, which does not include a check valve, keeps in connection the delivery line and the bypass line, in that way permitting to lower the pressure all around the system and not only in the source line of the valve.

Dimensions: 7.51" x 3.25" x 1.97"


  • Flow Rate: 10.5 GPM
  • Rated Pressure: 4050 PSI
  • Maximum Pressure: 4500 PSI
  • Maximum Temperature: 195° Fahrenheit (continuous use at 140° Fahrenheit)
  • Inlet Port: 3/8" FNPT (x2)
  • Discharge Port: 3/8" FNPT
  • Bypass Port: 3/8" FNPT (x2)
  • Weight: 1.5 lbs.


  • NEW improved design!
  • Reduced pressure loss
  • Makes for easier gun operation
  • Extremely reliable
  • Easy maintenance
  • Includes knob fitted with locknut for easy pressure adjustment
  • Facilitates water discharge in pressure during start-up
  • Reduces energy required for start-up

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