General Pump 100538 4000 PSI Adjustable Thermostat 86-250F 16
General Pump 100538 4000 PSI Adjustable Thermostat 86-250F 16
- Order Policies
- Item# 6712
Couldn't load pickup availability
General Pump Pressure Washer Pump - Professional Grade
This general pump pressure washer pump is built for professional pressure washing contractors and commercial cleaning operations, with rated for 4000 PSI. Designed for the demands of daily commercial use - not weekend homeowner projects. General Pump has earned a reputation among working contractors for building equipment that holds up under daily use. Available at Sun Brite Supply in Gaithersburg, MD - stocked and ready to ship.
The 4000 PSI rating handles the pressures of commercial-grade systems without exceeding safe operating limits. Every component at Sun Brite Supply is the same equipment our team has used and trusted across 30 years in the pressure washing industry. We don't stock consumer-grade parts with professional labels - if it's in our catalog, it's contractor-tested.
Where Contractors Use This Pressure Washer Pump
Application and Compatibility
Triplex plunger pumps deliver smooth, low-pulsation flow that's easier on your system than axial cam designs. The ceramic plungers resist wear from abrasive water, and the forged brass manifold handles thermal cycling without cracking. These pumps are built for thousands of hours of commercial operation when properly maintained. If you're not sure about compatibility, call (301) 519-9274 - we match parts to machines every day.
The performance gap between professional-grade and consumer-grade equipment shows up on every job. Contractors who invest in commercial components spend less on replacements, finish jobs faster, and deliver results that earn repeat business and referrals. That's the math that matters when you're running a pressure washing company - not just the upfront price tag.
Installation and Setup
Match GPM and PSI to Engine
Check your engine's HP and RPM output against the pump's rated input. Over-driving a pump beyond its rated RPM burns seals in weeks. Under-driving it gives you low pressure and cavitation.
Check Shaft and Mounting
Verify shaft diameter, key size, and mounting pattern match your frame or engine coupler. Belt drive pumps need matched sheave ratios for correct RPM.
Prime and Test
Fill the pump with water before first start - running dry even for seconds damages ceramic plungers. Check for leaks at all fittings before putting the machine under load.
Compatible With
Specifications
| Brand | General Pump |
| Product Type | Pressure Washer Pump |
| Max Pressure | 4000 |
| Ships From | Gaithersburg, MD |
Maintenance and Troubleshooting
Winterize your pump if the machine sits in freezing temperatures. Water expanding inside the pump head cracks the manifold. Drain all water and run pump antifreeze through the system before storage.
When to Replace vs. Repair
If this pressure washer pump shows signs of wear but is still functional, a rebuild kit or replacement seals may extend its service life at a fraction of the full replacement cost. However, if you see cracks, cross-threading, severe corrosion, or complete failure under pressure, replacement is the safer and more economical choice. Call (301) 519-9274 and we'll help you decide. Always follow OSHA pressure washer safety guidelines when working with high-pressure equipment.
Frequently Asked Questions
Need Help Choosing the Right Part?
30+ years of industry experience. We match parts to machines every day.
Why Buy From Sun Brite Supply?
Sun Brite Supply has served pressure washing contractors from our Gaithersburg, MD location since 2011. We stock the professional-grade parts and equipment you won't find at big box stores. Every in-stock order ships within 24 hours. Local customers can pick up the same day. Call (301) 519-9274 and talk to someone who knows this equipment - not a call center.