No socket, no limit · review
3400 PSI and 2.6 GPM, with M22 accessory compatibility stated.
Where this ends up The top of Westinghouse’s three, and the only one of them to list which accessories its fittings accept — surface cleaners, undercarriage cleaners and foam cannons with M22. Three years of cover on a sealed pump with no thermal relief published.
“Compatible with Pressure Washer Accessories such as Surface Cleaners, Undercarriage Cleaners, and Foam Cannons with M22 fittings.”
Eleven listings, and one of them names the attachments.
M22 is the threaded connection between hose and gun, and it is the domestic standard. Four Simpson listings publish “Pump/Hose Connection: Threaded M22” as a bare specification, without saying what it lets you buy.
The three accessories named are the three that matter:
A surface cleaner is what transforms a driveway — a wheeled disc with two spinning nozzles under a skirt, cleaning a twelve to twenty inch swathe at a fixed height instead of a single jet you sweep back and forth. It eliminates the zebra stripes, and it is four or five times quicker.
A foam cannon is the one for cars: thick clinging detergent rather than a thin spray, which is what lifts road film without a sponge.
An undercarriage cleaner is a flat bar you drive over, which no other listing here mentions.
All three are bought after the machine — which is precisely when people discover the fitting does not match. Having it stated is worth more than most of this listing’s specifications.
2.6 GPM is the highest flow of the three Westinghouse machines and the highest on this shelf under four hundred dollars.
It matters for the surface cleaner above, because a surface cleaner has no motor. Its two nozzles sit on a swivel and are spun by the water leaving them, in reaction, like a lawn sprinkler. Flow turns the head; pressure hits the concrete.
Below about 2 GPM, a wide head turns too slowly and leaves stripes. At 2.6 GPM this will drive a twelve to sixteen inch head properly. A twenty inch head is asking a lot.
Across the shelf: WPX3000 2.3 · DeWalt 2.4 · WPX3200, PowerSmart and four Simpsons 2.5 · this 2.6 · Simpson PS60869 3.5 · Simpson CRX and ALH4240 4.0.
The three big Simpsons are where a twenty inch head belongs.
And 3400 PSI sits comfortably inside the 2000 to 4000 band most surface cleaners are rated for, without exceeding the lighter heads that cap at 3000 or 3200.
3400 × 2.6 = 8840. The industry measure is PSI × GPM, and no listing on this shelf publishes it.
Simpson CRX 4400 — 17,600 · Simpson ALH4240 — 16,800 · Simpson PS60869 — 14,000 · PowerSmart — 9500 · Simpson Aluminum 3600 — 9000 · this — 8840 · Simpson PS3228 and PS61002 — 8250 · Westinghouse WPX3200 — 8000 · DeWalt DXPW3300 — 7920 · Westinghouse WPX3000 — 6900
So this beats the Simpson PS3228 at $659 and the PS61002 at $639.99 on raw output, and loses to the PowerSmart at $259.99 — which is also the only listing here with PWMA performance certification, meaning its figures were verified by somebody other than the maker.
Pressure cuts, flow rinses. What you buy with the Simpsons at nearly twice this price is not output; it is the pump.
Ten per cent more work, a slightly bigger tank, and the accessory note.
Output: 3400 / 2.6 against 3200 / 2.5 — 8840 against 8000 cleaning units. Fuel: 1 gallon against 0.9, which is perhaps fifteen minutes more running. The M22 accessory list, which the WPX3200 does not have.
Everything else is identical, down to a catalog weight difference of 24 grams: 28,600 g (1008.8 oz) against 28,576 g (1008 oz). Same 212cc engine, same axial cam pump, same half gallon soap tank, same 25 foot hose, same five nozzles, same never-flat wheels, same 3-year coverage.
Both sit above the WPX3000 at $299, which drops to four nozzles — losing the 15 degree — and replaces the soap tank with a “detergent siphon hose”.
All three Westinghouse listings publish “3-Year Limited Manufacturer Service, Labor, and Parts Coverage”. The other eight listings on this shelf — five Simpsons, the DeWalt, the PowerSmart — publish nothing.
And there is an irony worth stating: the three machines with the weakest pump type carry the only warranty here.
“Maintenance-free axial cam pump” reads as a benefit and describes a limitation. Axial cam pumps run directly off the crankshaft, cost little, and cannot be serviced — when the seals go the pump is replaced, not repaired. Service life is typically in the low hundreds of hours.
The five Simpsons take the other path: triplex plunger pumps with replaceable seals, an “integrated unloader” and thermal relief, rated in thousands of hours — and no published warranty at all.
So the choice across this shelf is between a pump that lasts and a promise if it does not. The nationwide service network is the part that makes the promise real.
No thermal relief valve is published, and it is the commonest way these pumps die.
Release the trigger and the engine keeps running, so the pump keeps turning with water circulating inside it and nowhere to go. Within a minute or two it is hot enough to damage seals and valves.
A thermal relief valve dumps that water on the ground before it happens.
The DeWalt at $429 uses the same type of axial cam pump and publishes one — “Thermal relief valve prevents overheating for long-lasting performance”. All five Simpsons publish one plus an unloader.
The three Westinghouse machines and the PowerSmart publish neither.
The practical rule on any of these: do not leave it running with the trigger off. On a sealed pump, that habit is what the warranty is really insuring against.
12 inch high profile, never-flat — solid, on all three Westinghouse machines. They cannot puncture and never need air, so a machine left from autumn to spring rolls when you want it.
All five Simpson listings argue the other way in identical words: “10” premium pneumatic tires roll smoothly over gravel, grass, and curbs.” Which is true: an air tire deforms and climbs where a solid one skids and transmits every bump.
At 28,600 g (1008.8 oz) this is mid-weight on a shelf running from 23 to 61 kilograms, and the three heaviest Simpsons move up to 13 inch pneumatics because weight makes rolling harder.
Engine oil, tools and a quick start guide are included, which most listings here do not state.
No thermal relief valve, as above.
No low-oil shutdown, which cuts the engine before it seizes. The DeWalt at $429 publishes one, and so do the four Honda-engined Simpsons. Not this, its siblings, the PowerSmart, or the $899.99 Simpson CRX.
No unloader.
No hose bore. Its own sibling the WPX3000 publishes “Interior Hose Diameter - 0.25 inches”, and three Simpson listings publish 5/16 or 3/8 inch depending on hose length — because a longer hose needs a wider bore to avoid losing pressure to friction.
No PWMA certification, which only the PowerSmart claims and which is the only independently verified PSI figure on this shelf.
No state restriction, which counts in its favor: all five Simpsons are “49-State Compliant (Not for sale in California)”.
And the usual honesty, shared with the DeWalt and the Simpson CRX: “functionally tested in the factory and may contain minimum residual oil and/or fuel odor”. A machine that smells of petrol has been run before shipping, which is better than one that has not.
Read on the day this page was built: $350 at the American Amazon shop.
Read from Keepa on the day this page was last revised; stock and price both move without notice.
Prices quoted in this text were read on 2026-10-04. The live price is at the top of the page.
| Accessories | States compatibility with surface cleaners, undercarriage cleaners and foam cannons with M22 fittings |
|---|---|
| Output | 3400 PSI and 2.6 GPM — 8840 cleaning units, the highest flow of the three Westinghouses |
| Warranty | Three years of service, labor and parts with a nationwide network |
| Soap | Half gallon onboard tank |
| Fuel | 1 gallon tank — the largest of the three |
| Nozzles | Five — 0, 15, 25, 40 degrees and soap |
| Pump | Maintenance-free axial cam |
| Engine | 212cc four-stroke Westinghouse OHV, recoil start |
| Hose | 25 feet, abrasion-resistant super-flex |
| Wheels | 12 inch never-flat, on a steel frame |
| Weight | 28,600 g (1008.8 oz) |
| Thermal relief | Not published |
| Low-oil shutdown | Not published |
| Amazon reference | B094DWHPDL |
| EAN | 0850011336656 |
Because the first accessory most people buy will not fit without it, and this is the only listing on the shelf to spell it out: "Compatible with Pressure Washer Accessories such as Surface Cleaners, Undercarriage Cleaners, and Foam Cannons with M22 fittings." M22 is the threaded connection between the hose and the gun, and it is the standard on domestic machines — four Simpson listings publish "Pump/Hose Connection: Threaded M22" as a specification without saying what it lets you add. A surface cleaner is the attachment that transforms a driveway: a wheeled disc with two spinning nozzles under a skirt, which cleans a twelve to twenty inch swathe at a fixed height instead of a single jet you sweep back and forth. A foam cannon is the one for cars, laying thick detergent rather than a thin spray. An undercarriage cleaner is a flat bar you drive over. All three need the fitting to match, and all three are bought after the machine — which is exactly when you discover whether it fits. Worth noting the flow requirement: most surface cleaners want 2 GPM or more, and at 2.6 GPM this is the best-fed Westinghouse here.
Twenty dollars for a slightly larger engine tank and a little more of everything, and it is a closer call than the step up from the WPX3000. Output goes from 3200 PSI / 2.5 GPM to 3400 / 2.6 — in cleaning units, 8000 to 8840, about ten per cent. The fuel tank goes from 0.9 to 1 gallon, which is perhaps fifteen minutes more running. And this listing adds the M22 accessory note and a slightly fuller hose description. Everything else is identical: same 212cc engine, same axial cam pump, same half gallon soap tank, same 25 foot hose, same five nozzles, same 12 inch never-flat wheels, same 3-year coverage, and the catalog weights are within 24 grams of each other at 28,600 g (1008.8 oz) and 28,576 g (1008 oz). So the twenty dollars buys ten per cent more work and the confidence that a surface cleaner will fit. Both sit above the WPX3000 at $299, which drops to four nozzles and a detergent siphon hose in place of the tank.
Yes, and it is the best-fed machine of the three Westinghouses for one. A surface cleaner has no motor: its two nozzles sit on a swivel and are spun by the water leaving them, in reaction. So flow is what turns the head — pressure decides how hard the water hits the concrete, flow decides how fast the arm goes round. Below about 2 GPM a wide head turns too slowly and leaves stripes. At 2.6 GPM this will drive a twelve to sixteen inch head properly; a twenty inch head is asking a lot. For comparison across the shelf: the WPX3000 manages 2.3 GPM, the DeWalt 2.4, the WPX3200 and four Simpsons 2.5, the PowerSmart 2.5, and the three big Simpsons 3.5 to 4.0 GPM, which is where a twenty inch head belongs. The other figure to match is pressure: most surface cleaners are rated for a window, and at 3400 PSI this is comfortably inside the common 2000 to 4000 band without exceeding the lighter heads that cap at 3000 or 3200.
cleaning machines from the same category, at nearby prices. Only what all of them publish is shown: a column with holes compares nothing.
| Model | Price | Output | Warranty | Nozzles | Pump |
|---|---|---|---|---|---|
| Westinghouse WPX3400 | $350 | 3400 PSI and 2.6 GPM — 8840 cleaning units, the highest flow of the three Westinghouses | Three years of service, labor and parts with a nationwide network | Five — 0, 15, 25, 40 degrees and soap | Maintenance-free axial cam |
| Westinghouse WPX3200 | $330 | 3200 PSI and 2.5 GPM — 8000 cleaning units | Three years of service, labor and parts with a nationwide network | Five — 0, 15, 25, 40 degrees and soap | Maintenance-free axial cam |
| Westinghouse WPX3000 | $300 | 3000 PSI and 2.3 GPM — 6900 cleaning units, the lowest on this shelf | Three years of service, labor and parts with a nationwide support network | FOUR, not five — it drops the 15 degree tip | Maintenance-free axial cam — see the FAQ on what that means |
| DeWalt DXPW3300-S | $430 | 3300 PSI at 2.4 GPM — 7920 cleaning units | Not published | Five quick-connect, with a 16 inch steel wand | OEM Technologies axial cam |
Details checked on October 4, 2026.
A homeowner who will add a surface cleaner and wants the fittings confirmed first
Amazon reports what buyers took in the month before this page was last checked: at least 700.
The figure is a floor, rounded by Amazon, and read through Keepa — it says what buyers picked, not what a maker claims.
Specifications: the manufacturer sheet for cleaning machines and the matching Amazon product page. Prices and availability: Keepa. Every figure on this page names its source.
2,200 PSI (≈ 152 bar) · 2.3 GPM · single-cylinder air-cooled
The most modest petrol machine here, and the only one listed on all six Amazon stores.
Best for: Large gardens and outbuildings without power, where 150 bar is plenty
170–190 bar · 3,400 rpm · axial cam pump · self-priming
A modest pressure range honestly stated, on an axial pump — the entry to petrol here.
Best for: Occasional work away from a socket — a smallholding, a boat yard, a second property
234 bar working · 590 l/h · 5.9 hp four-stroke · 9 m (30 ft) hose
The only machine on this site that publishes a working pressure and a flow rate together.
Best for: Farmyards, contractors and large properties without power at the far end
