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SIMPSON

Simpson PS4240 PowerShot Gas Pressure Washer Powered by Honda GX390, 4200 PSI at 4.0 GPM, (49 State) 60456 | Gas Power Washer For Professionals. AAA Triplex Pump, 50' Hose, 5 Nozzles, Welded Steel Frame. 49-State Compliant. 60456

  • Based on 494 reviews
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Style: 4200 PSI


Features

  • SIMPSON PRESSURE WASHER FOR PROFESSIONALS: The Simpson PowerShot gas power washer cleans decks, driveways, siding, fencing, equipment, and graffiti; The cold water machine is great for contractors; 49-State Compliant (Not for sale in California)
  • ENGINE & PUMP: Premium Honda GX390 engine starts easily and includes low-oil shutdown; Maintenance-free 4200 PSI 4.0 GPM AAA triplex plunger pump with an integrated unloader and thermal relief to prevent overheating; Designed for a long service life
  • LONG HOSE REACH: The Simpson Monster series 50' dual-braided high-pressure hose resists kinks and abrasion; Non-marring polyurethane jacket helps protect finished surfaces; Quick-connect fittings speed setup
  • EASY MOBILITY: 13" premium pneumatic tires roll smoothly over gravel, grass, and curbs; Balanced layout improves transport; The welded steel frame with powder-coated finish is easy to assemble and resists corrosion; 38" L x 23.5" W x 29" H; 136 lb.
  • PRO PRESSURE WASHER ACCESSORIES: Five quick-connect pressure washer tips (0, 15, 25, 40, and soap nozzle) cover tasks from stripping paint to car cleaning; Rear-load QC pressure washer gun and 31" spray wand included

Description

The SIMPSON Power Shot 4200 PSI at 4. 0 GPM is ideal for prosumers and professionals alike. This is a powerful option for deep outdoor cleaning, job site use, equipment upkeep and facility or fleet maintenance. This product is engineered to meet the demands of a cleaning professional. The PS4240 features a commercial HONDA GX390 engine, reliable AAA industrial triplex pump, 50-ft kink & abrasion resistant hose, ergonomic spray gun and 5 Quick-connect nozzles. Designed to meet the rigorous demands of the cleaning professional, the SIMPSON Power Shot Series frame is crafted of solid steel making it powerful, yet extremely compact, easy to transport, set-up and load. Perfect for contractors who specialize in deck cleaning, wood restoration, paint preparation, graffiti removal and all other professional cleaning services. The SIMPSON Power Shot Series designed for optimum performance in the harshest environments. 3 year limited HONDA commercial engine, 5 year limited pump, 10 year limited frame and 90 day accessory. From the Manufacturer The PowerShot is an extremely powerful direct drive machine. The PowerShot is “The Choice” for Contractors and Cleaning professionals who want direct drive simplicity and SIMPSON quality in one package. More pressure and more water flow result in even greater cleaning performance and faster job completion. Those who agree that “Time is Money” use the PowerShot! Warranty Details: Engine - 3 Year Limited Commercial Warranty | Pump - 5 Year Limited Warranty | Frame - 10 Year Limited Warranty

Brand: SIMPSON


Power Source: Gasoline


Color: Black


Item Weight: 141 pounds


Hose Length: 50 feet


Product Dimensions: 8"L x 3"W x 50"H


Tank Volume: 1.61 gallons


Maximum Flow Rate: 4 gpm


Global Trade Identification Number: 13


Maximum Pressure: 4200 psi


Item Weight: 141 pounds


Hose Length: 50 feet


Item Dimensions L x W x H: 8"L x 3"W x 50"H


Tank Volume: 1.61 gallons


Wand Length: 31 inches


Power Source: Gasoline


Maximum Flow Rate: 4 gpm


Maximum Pressure: 4200 psi


Color: Black


Brand Name: SIMPSON


Model Number: PS4240H-SP


Global Trade Identification Number: 13


UPC: 879399000713


Unit Count: 1 Count


Manufacturer Warranty Description: 3 Year Limited Commercial Warranty | Pump - 5 Year Limited Warranty | Frame - 10 Year Limited Warranty


Included Components: Pressure Washer Powered by Honda GX390,


Item Type Name: Gas Pressure Washer Powered by HONDA GX390


Manufacturer: SIMPSON


Manufacturer Part Number: PS4240S


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Saturday, Aug 29

This item is non-returnable:

Non-returnable. Transportation of this item is subject to hazardous materials regulation

View our full returns policy here.

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Similar Products

Top Amazon Reviews

    • OMG, why did I wait to get this?
Style: 4200 PSI
I have has a smaller electric unit (Westinghouse 2K), which I still love and will use a lot for smaller jobs. However I have a lot of hard surfaces on my property and, living in the Pacific NW with the rain, trees and shade means I also have a LOT of moss and other organic buildup to deal with. I have done a lot of research. I've purchased other pressure washers. I finally decided to make the investment in a commercial grade machine because I wasn't getting the results I wanted in any reasonable amount of time and my electric simply doesn't drive a surface cleaner. Manually wanding my driveway was taking days with the electric and that was just focusing on the most important areas. So, with some advice of a trusted friend who owns a rental company, I decided to take the plunge on something with enough pressure (4k PSI) and GPM (3.5 or more) to make a meaningful impact. All I can say is: Wow! In the first 3.5 hours of use, coupled with the Mekoh 18" surface cleaner, I was able to clean 3 times the amount of moss-coated (thick in many spots) surface compared to the surface cleaned in 3+ days manually wanding. I also have a sports court which needs love and will be my next tackle. The obvious concern I've had is not stripping off the paint, but still getting the surface clean. So I wanted something I could "back down". While the pump on the 4240 has a regulator, I actually purchased the Simpson pressure regulator and it seems to work quite well. I suppose I could use the pump regulator in tandem with the extra in-line Simpson regulator to really dial it in, but I'd prefer not to muck about with the pumps factory settings. To address some of the concerns I've seen in other reviews: the unit arrived in excellent condition obviously all new and delivered on time. The modest assembly of the draw bar and wand and hose caddy was a matter of two minutes, easy peasy. The Honda engine instructions and the Simpson quick start guide were easy to follow in terms of adding the oil, fuel and then start up. Start up was just as straightforwardas the manual said, and, as long as I was following those instructions [ahem], it started on the first pull every time. I did make a note that others had said it's helpful to pull the trigger when starting and so I did that (but not always, and even when I didn't, and I had the switches and throttles in the right position, it still started on the first pull). While I have only used it for a short time, there was absolutely no evidence of oil leaking or any of the other mechanical issues mentioned. If this changes over time, I'll come back and edit this review. Everything about the pressure washer is commercial/contractor grade. The Monster hose is just that - it seems like it will withstand anything but does take extra effort to maneuver. In all, the unit does require strength and some stamina to operate (because it's so strong) and you'll need a ramp or some help to get it into the back of a pickup. But if you compare it's effectiveness and the substantial reduction of time, I'd say overall that it takes much less effort to get amazing results than less powerful models. Bottom line: if you're tired of putting up with lesser units, and have the budget for this fantastic monster, I highly recommend it. ... show more
Reviewed in the United States on April 26, 2024 by Will Riffle
    • Lots of power-works well
Style: 4200 PSI
Excellent first impression. The Honda GX390 started easily, the machine feels extremely solid, and the 4.0 GPM flow is noticeably stronger than homeowner-grade pressure washers. Assembly was simple, and all components appear to be high quality. I purchased this for driveway cleaning and small business use, and it looks like it will be more than capable. Very happy with the purchase so far. ... show more
Reviewed in the United States on June 21, 2026 by Mark P.
    • Disappointed in Quality Control and Customer Support; Motor rubbing on tire
Style: 4200 PSI
Review Image by OhJohnnyRhodes
Review Image by OhJohnnyRhodes
Review Image by OhJohnnyRhodes
Review Image by OhJohnnyRhodes
Review Image by OhJohnnyRhodes
Disappointed in Quality Control and Customer Support EDIT: Amazon made right after contacting them several times. This was a problem on Simpson's end, and they never took any accountability. They were not only hard to get in contact with, but incredibly dismissive of my having an $1100 brick. This is a 1 star for Simpson, and I will never buy any product from them again. Amazon, thank you for dealing with this problem from... omg... it's like Homer Simpson hiding in the bushes. -end EDIT I bought the Simpson 4200 PSI / 4.0 GPM pressure washer and was excited to put it to work—until I realized the cart was rubbing on the motor right out of the box. Not exactly confidence-inspiring on a brand-new unit. There was no way to move the cart at all. This would have been noticed while putting the washer in the box, assembly, or any other step of the way. What other problems am I going to find with this? I reached out to Simpson expecting some accountability or a solution, but instead they just passed the buck and told me to take it up elsewhere. No real help, no interest in fixing the issue. "We just do Parts," the person on the phone told me. Well the parts didn't fit together! For a premium-priced machine, I expected a lot more from both the product and the support team. They told me to try and contact Amazon instead. Very rude person on the phone there as well. I am going to probably end up fixing this myself. You can see from the pictures they mounted the washer 2 inches too far to the left facing the front of the machine. It would be one thing if the manufacturer owned up to the mistake, but she couldn't wait to get me off the phone fast enough. I've never had worse service. I emailed several times with no answer as well. ... show more
Reviewed in the United States on April 14, 2025 by OhJohnnyRhodes
    • Good pressure washer with Honda GX390
Style: 4200 PSI
Pressure washer was easy to assemble. Took 20 minutes to unbox and put together including adding fuel and oil. started right up and I was able to pressure wash my walkway quickly. Has lots of power. I was wanting one with the honda GX390 motor and this unit is a good value.
Reviewed in the United States on June 5, 2026 by agostino
    • Buy this yesterday! It’s great!
Style: 4200 PSI
Review Image by Alan I.
Easy assembly, great product. This pressure washer blasted the years of moss and algae off the bottom of my 1984 Mohawk Canoe! Didn’t hurt the finish at all. Easily controlled pressure! The provide frame and wheels help roll it around even in gravel!!!
Reviewed in the United States on May 24, 2026 by Alan I.
    • Slight scuffs, partial refund issued so no complaint. Works greats
Style: 4200 PSI
Review Image by Hank
Reviewed in the United States on July 10, 2026 by Hank
    • Great washer, needs a better trigger handle.
Style: 4200 PSI
This is a very powerful washer, and appears to be of high quality. I will recommend that before buying one, expect to upgrade the trigger handle, (Mine broke in two in less than an hour of use. The handle is very flimsy.) And adding another 50' length of high pressure hose is a good idea. If you never put a flat surface attachment on the trigger gun, it may not break as mine did. But the heavy duty Cat Pumps gun I replaced it with is so much better in every way it can be. A washer like this should come with a decent trigger. The extra length of hose helps keep noise and fumes away, and also lets me work more without moving the washer as much. ... show more
Reviewed in the United States on November 8, 2013 by Eric Barnhizer
    • The amazing Simpson PS 4240
Style: 4200 PSI
I am thrilled with the PS4240 power washer. It throughly cleans everything with minimal effort. Every homeowner should have one! Jeff Bird
Reviewed in the United States on July 20, 2026 by Jeff Bird

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