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General Pump YU21235 Trapped Pressure Unloader 2600 PSI, 21 GPM

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2.62 lbs
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Trapped pressure unloader from General Pumps. Brass housing with a yellow spring. Has a 21 GPM flow rate and and a maximum pressure rating of 2600 PSI.

Technical Specifications

Inlet Port: 1/2 inch
Max GPM: 21
Max PSI: 2600
Max Temperature: 200 degrees F

Product Description

Adjustable Unloader

The General Pump YU21235 Pressure Unloader regulates the maximum pressure of the system by varying the flow discharged by the bypass. Adjustment is made when a piston alters the position of a sphere inside the regulator. When the gun is opened, water flows through the valve which maintains the system pressure until the gun closes. The interruption of flow completely opens the bypass, allowing the discharge to flow at low pressure. This unloader has a maximum pressure of 2600 PSI.
Dimensions: 7.57" x 3.96" x 1.5"


  • 21 GPM
  • 2600 PSI maximum pressure
  • 2300 PSI rated pressure
  • Inlet: 1/2" (x2) FNPT
  • Outlet: 1/2" FNPT
  • Bypass: 1/2" (x2) FNPT
  • Maximum Temperature: 200° Fahrenheit
  • Yellow spring
  • Weight: 3.1 lbs


  • Updated design surpasses previous models
  • Reduced pressure loss
  • Streamlines gun operation
  • Reliable service and simple maintenance

Product Reviews

Frequently Asked Questions

Question:Is this a good option for a cat310 pump? - Eric (07/13/2021)
Response:Yes, this could work for a 310 pump. Another option is part number GPU831D