I have the 4200 psi washer. Will this thing explode and cause a tsunami or can i just dial it down and bit an use it just fine?

Pressure gauge and pressure unloader knob to dial down the pressure it will work fine. If you only turn the engine speed down it may not be enough to drop the pressure low enough. Also the static pressure when you open the trigger may be quite large even though you are running less pressure when operating. For example I’ll dial down my bigger unit to 3200 psi delivering water but the gauge will read 5000+ psi when I close the gun and that has cracked the steel attachment pivot on two 10” surface units rated at 3200 when I opened the flow. You can’t open k lbs of pressure slowly.

what is the brush material, wire or softer? I need wire or very stiff bristles.

Very stiff bristles, but that really doesn't matter as it doesn't come into contact with the surface being cleaned. Its the 2 nozzles rotating that does the job.

Will this unit work with a 2800 psi Troy Bilt gas power washer?

I'm not sure about a 2800 PSI but mine is a 3750 PSI and it struggled to work and second day the nozzle broke off of it so I neither have to tap it to get it out wasn't worth the money for me

I am getting 4400 psi 4 Simpson power washer??? Can I use this with that????

Not recommended, the components of the surface cleaner are only rated to 3600 psi. You may want to look into Simpson's Surface Cleaner 80182 rated at 4500 psi.

Surface Cleaner | Desertcart Mali

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Description

🚀 Clean smarter, not harder — dominate your outdoor space with streak-free speed!

MAINTENANCE MADE EASY - Includes a nozzle cleaning tool to prevent clogging and maintain peak performance, extending the life of your surface cleaner.
UNIVERSAL QUICK CONNECT - 1/4-inch quick connection fits most gas-powered cold water pressure washers for effortless setup and compatibility.
MAXIMIZE CLEANING EFFICIENCY - 15-inch diameter covers 10X more surface area than standard nozzles, speeding up your outdoor cleaning routine.
DURABLE CORROSION RESISTANT - Powder-coated steel shroud and stainless steel nozzles ensure long-lasting use and protect against overspray.
POWERFUL PRESSURE PERFORMANCE - Operates between 2200-3700 PSI with 3.4 GPM flow for streak-free, deep cleaning on driveways, patios, and sidewalks.

The Simpson Cleaning 80165 is a robust 15-inch steel surface cleaner designed for cold water pressure washers between 2200 and 3700 PSI. Featuring dual high-pressure rotating jets, it delivers 10X more coverage than standard nozzles, ensuring fast, streak-free cleaning of large outdoor surfaces. Its powder-coated steel shroud and stainless steel nozzles provide durability and corrosion resistance, while the 1/4-inch quick connect ensures universal compatibility. Perfect for professionals and homeowners seeking efficient, high-performance outdoor cleaning.

Specifications

ASIN	B07H5BJ3VR
Best Sellers Rank	#17,892 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #103 in Pressure Washers #154 in Pressure Washer Accessories
Brand Name	SIMPSON
Color	Black
Customer Reviews	4.1 4.1 out of 5 stars (5,586)
Global Trade Identification Number	00879399001772
Included Components	Surface cleaner, unclogging tool
Item Type Name	15" Steel Pressure Washer Surface Cleaner for Cold Water Machines, 1/4" Quick Connection, Recommended Min 3000 PSI up to Max of 3700 PSI
Item Weight	5.5 pounds
Manufacturer	SIMPSON
Manufacturer Part Number	80165
Manufacturer Warranty Description	90 Day limited accessory warranty
Maximum Flow Rate	3.4 gpm
Maximum Pressure	3700 psi
Model Number	80165
Number of Items	1
Power Source	Gas Powered
UPC	879399001772
Unit Count	1 Count

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