Internet #203560246

Model #VRT3-310

Black Unloader Spring

Product Overview

Newly introduced Mecline VRT3 Unloader is an updated version of the Arrow Line VRT Unloader with a stronger valve body with less porosity. The pressure adjustment handle was redesigned for easier operation at all pressure levels. New design features: Interior design more efficient flow and operation dual locking Nuts vibration resistant for setting maximum pressures new spring material more resistant to fatigue, powder paint resists rusting piston large Dia, more strength and contact area for shifting alignment Discharge Nipple sealing o-ring has been moved to the lower part of the thread, increases hydro strength and fitting strength shutter valve hex design, less contact area for smooth shifting (prevents binding). larger size, longer life and more positive shifting featuring: Over sized handle easier adjustment forged valve body excellent strength 2 inlet ports 2 by-pass ports Ultra thick inlet and discharge ports - added strength Color coded springs and caps easy valve identification all ports are FNPT Specifications: Spring Color: Black: Replaces AL607 & AL607X Maximum Pressure: 4,495 PSI Max. Volume: 8.0-GPM Adjustable pressure brass valve body max. Fluid Temperature 194°F.
  • California residents
  • Inlet ports (2): 3/8 in. FNPT
  • Discharge ports (1): 3/8 in. FNPT
  • Bypass ports (2): 3/8 in. FNPT
  • Weight: 29.6 oz.

Info & Guides

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Number of Pieces

Warranty / Certifications

Manufacturer Warranty
One year limited

Questions & Answers


What is the lowest psi setting on this?

Asked by Jim June 26, 2019

Adjust the pressure to the point matches the incoming water pressure thus allowing the use of chemical injection. You can also set the max and min pressures via the unloader.

What does this do

Asked by Al May 23, 2019

When connected to a compatible pressure pump, the PSI can be varied from low pressure to high pressure by turning the black knob. Call Customer Service at 866-235-5112 8-5pm CST M-F if you have any questions.

Customer Reviews

  • 2 Customer Reviews
  • 5 out of 5 stars overall
100% of customers recommended.
Overall Ratings
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Excellent Unloader, easy to adjust. The VRT3-310 Black Unloader is connected to my AR RKV4G40HD-F...
Excellent Unloader, easy to adjust. The VRT3-310 Black Unloader is connected to my AR RKV4G40HD-F24 pump driven by a Lifan 389cc Engine model # LF188F-BQ. The Unloader, Pump and Engine all purchased from Home Depot. In the attached picture, the engine is running 3600rpm driving the pump @ 4000psi / 4gpm. I design this setup to run the engine @ 3200rpm while adjusting the unloader to 3000psi for most projects around the house. The lower rpm reduces the engine noise with a lost of torque to drive the pump to max psi. The throttle valve in the photo is slightly opened continuously to release small flow of warm water allowing cooler water enter pump to prevent over heating while idling, TPP140 Thermal Relief Valve also installed. The larger Ball Valve is opened only to release pressure from the pump if necessary and to blow-out the pump after use. Overall excellent Unloader that's a vital part of my Pressure Washer setup. Home Depot is the best, fast ship to store... Thank you
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Seems to made of quality materials and works well. ...
Seems to made of quality materials and works well.
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