U.M.R. Kit VRT3-310 Unloader Ready Kit for Pumps Up to 4500 PSI with 1/2" FPT Inlet & 3/8" FPT Outlet – OEM Replacement Part
Part Number: 4642
Category: Pressure Washer Parts → Unloader Valves → Unloader Kits
Type: U.M.R. Kit VRT3-310 Unloader Made Ready Kit
The U.M.R. Kit VRT3-310 Unloader Made Ready Kit (Part #4642) is a complete OEM replacement solution designed to simplify the replacement of worn, damaged, or malfunctioning pressure-actuated unloader valves on pressure washer systems rated up to 4,500 PSI. Built around the trusted VRT3-310 pressure-actuated unloader, this all-in-one kit includes the essential components needed for a convenient unloader replacement and installation.
Image shown for illustrative purposes only
Key Features & Benefits
- Complete VRT3-310 Unloader Made Ready replacement kit
- Designed for pumps rated up to 4,500 PSI
- Simplifies unloader replacement and installation
- Includes essential installation components
- Pressure-actuated unloader design
- Helps protect pumps from pressure spikes
- Restores proper pressure regulation
- Reduces downtime during repairs
- Suitable for commercial and industrial pressure washers
- Ideal for maintenance, repairs, and equipment upgrades
- Professional-grade components
- Easy-to-follow installation instructions included
Technical Specifications
Part Number: 4642
Model: VRT3-310 U.M.R. Kit
Product Type: Unloader Made Ready Kit
Maximum Pressure: 4,500 PSI
Inlet Connection: 1/2" FPT
Outlet Connection: 3/8" FPT
Unloader Type: Pressure Actuated
OEM Replacement: Yes
Kit Contents
The U.M.R. Kit includes:
- Pressure-actuated unloader valve
- Inlet filter
- Quick-connect (QC) discharge fitting
- Push-on hose barbs
- Roll of Teflon thread seal tape
- Installation instruction sheet
Note: Components are supplied separately and are not pre-assembled or connected.
What a Pressure-Actuated Unloader Does
The VRT3-310 unloader is designed to:
- Regulate operating pressure
- Divert water flow when the trigger gun is released
- Protect pumps from damaging pressure buildup
- Reduce stress on hoses and fittings
- Improve overall system reliability
- Extend pressure washer service life
When spraying stops, the unloader redirects water through the bypass circuit until cleaning resumes.
Common Applications
Pressure Washer Repairs
Ideal for:
- Replacing worn unloader valves
- Pressure washer maintenance
- Commercial equipment repairs
- Contractor service work
- Preventative maintenance programs
Pressure Washer Systems
Compatible with:
- Commercial pressure washers
- Industrial cleaning systems
- Mobile wash trailers
- Skid-mounted pressure washers
- Hot water pressure washers
- Cold water pressure washers
Performance Benefits
- Faster unloader replacement
- Reliable pressure regulation
- Improved pump protection
- Reduced maintenance downtime
- Consistent cleaning performance
- Extended equipment lifespan
- Convenient all-in-one kit solution
- Professional-grade durability
Signs Your Unloader Needs Replacement
Consider replacing the unloader if you experience:
- Pressure fluctuations
- Inconsistent spray pressure
- Pump cycling issues
- Excessive bypass flow
- Difficulty adjusting pressure
- Water leaks around the unloader
- Reduced cleaning performance
- Excessive wear or corrosion
Installation Notes
- Shut down the pressure washer and relieve all pressure.
- Remove the existing unloader and related fittings.
- Install the included inlet filter and fittings.
- Apply the supplied Teflon tape to threaded connections as required.
- Connect the unloader according to the included instructions.
- Verify proper plumbing and bypass routing.
- Test the system for leaks and proper pressure regulation.
Important: Always verify compatibility with your pump's flow and pressure specifications before installation.
Maintenance Recommendations
- Inspect the unloader regularly for leaks and wear.
- Clean inlet filtration components periodically.
- Verify operating pressure during routine maintenance.
- Replace worn fittings and seals as needed.
- Maintain proper water filtration for maximum component life.
