No socket, no limit · review
Honda GX390, CAT pump with ceramic pistons, and a dual-braided 50 foot hose.
Where this ends up A Honda GX390, a CAT pump with ceramic-coated pistons, a gun that locks and a fifty-foot dual-braided hose — the only machine here where every component is the better choice. Its bullet says a hundred and thirty-three pounds and the catalog says a hundred and twenty-four.
Taken one at a time, this listing picks the superior option at each decision on the shelf.
The pump: CAT triplex plunger, where the other four Simpsons use AAA and the three Westinghouse machines and the DeWalt use axial cam. Axial cam pumps run straight off the crankshaft, are sealed and unserviceable, and are rated in the low hundreds of hours. Triplex plunger pumps run slower and cooler with replaceable seals, rated in the thousands. Cat Pumps is the step above AAA in this market.
And the detail that matters: “Advanced oil seal technology & ceramic coated pistons extend seal life.” What wears out a triplex pump is the seal riding on the plunger, and a ceramic-coated plunger is harder and smoother than plated steel, so it abrades the seal more slowly. That is the component you would otherwise replace, and this is the only listing on the shelf that addresses it.
The engine: Honda GX390 with low-oil shutdown — the largest Honda here. The CRX 4400 at $899.99 runs Simpson’s own CRX 420cc and publishes no low-oil shutdown; the three Westinghouse machines and the PowerSmart publish none either. A low-oil cutout kills the ignition before the engine seizes, which on a machine standing for months between uses is the realistic failure.
The gun: a safety lock-out, which only this and the Aluminum Series 3600 publish. At 4200 PSI with a 0° tip fitted, that is the most important two-dollar part on the machine.
The hose: 50 feet, dual-braided, 3/8 inch class, non-marring. Dual braiding is unique on this shelf.
The tires: 13 inch pneumatic, which the three heaviest Simpsons all use.
4200 × 4.0 = 16,800. The industry measure is PSI × GPM, and no listing here publishes it.
Simpson CRX 4400 — 17,600 · this — 16,800 · Simpson PS60869 — 14,000 · PowerSmart — 9500 · Simpson Aluminum 3600 — 9000 · Westinghouse WPX3400 — 8840 · Simpson PS3228 and PS61002 — 8250 · Westinghouse WPX3200 — 8000 · DeWalt — 7920 · Westinghouse WPX3000 — 6900
So the CRX at $899.99 beats it on raw output by five per cent, for five hundred and forty-nine dollars less — and with a house-brand engine, no low-oil shutdown, no gun lock and an AAA pump instead of CAT.
That is the shape of the decision at the top of this shelf: the CRX is faster and this one lasts.
Pressure cuts, flow rinses. At 4.0 GPM this is one of two machines here with real volume, which is what moves dirt off a driveway rather than merely loosening it — and what spins a twenty inch surface cleaner, since a surface-cleaner head has no motor and its nozzles are turned by the water leaving them.
Four gallons a minute is 240 gallons an hour, which on a metered supply is worth knowing.
The bullet publishes 133 lb. The catalog publishes 56,245 g (1984 oz), which is 124.0 lb. Nine pounds apart.
Across the other Simpsons the two sources agree closely:
PS60869 — “120 pounds” against 54,431 g, which is 120.0 lb exactly PS61002 — 74 lb against 33,021 g (72.8 lb) PS3228 — 77 lb against 33,929 g (74.8 lb) Aluminum 3600 — 78 lb against 35,834 g (79.0 lb)
Four of five match within a couple of pounds. This one is out by nine, and the pattern suggests the bullet is the high figure.
Either way it is the second heaviest machine on this shelf, behind the CRX 4400 at 61,235 g (2160 oz).
And the aluminum claim deserves the same scrutiny the cheaper model invites. The description calls this frame “ultra lightweight aircraft grade aluminum”, and the Aluminum Series 3600 is sold on “cutting weight” while publishing 78 lb against the steel-framed PS3228’s 77 lb.
What aluminum reliably buys is corrosion resistance, which the bullet also claims: a powder-coated steel frame rusts from any chip, and a pressure washer lives in a damp garage and gets soaked every time it runs.
38 × 23.5 × 29 inches published, matching the PS60869 exactly — and worth measuring against your garage. Four listings on this shelf publish no dimensions at all, and the CRX publishes catalog figures of 203 × 76 × 1270 mm, which cannot be a machine.
“The Simpson Monster series 50’ dual-braided high-pressure hose resists kinks and abrasion; Non-marring polyurethane jacket.”
Three things in one bullet.
Dual-braided means two layers of reinforcement rather than one. On a hose carrying 4200 PSI that is the burst margin, and it is also what stops a hose kinking into a permanent crease — which is how most high-pressure hoses actually fail.
Fifty feet means cleaning a whole side of a house without moving a 124 lb machine. Six listings here supply 25 feet.
Non-marring polyurethane is the detail three Simpson listings share and no other brand does: fifty feet of hose gets dragged across whatever you are cleaning, and a rubber jacket leaves black streaks on painted siding and decking that you then have to clean off.
The bore is not stated here, but the two other 50-foot Monster hoses on this shelf publish 3/8 inch — which is the right bore for the length, since a hose loses pressure to friction and a narrower bore loses more. For comparison the Westinghouse WPX3000 publishes 0.25 inch over 25 feet, and the 25 and 35 foot Morflex hoses are 5/16 inch.
Threaded M22 is the domestic standard and what lets you add a surface cleaner or foam cannon. Only the Westinghouse WPX3400 on this shelf says what M22 actually lets you buy.
Professional QC spray gun with safety lock-out — published by two listings here, this and the Aluminum Series 3600.
The other nine publish none: the PS60869 and CRX have an “ergonomic spray gun”, the PS61002 and PS3228 a “rear-load M22” gun, the DeWalt an “ergonomic” one, the three Westinghouse machines a “lightweight spray gun”.
What a lock prevents: a gun set down on the frame or a step with the engine running, where a foot, a hose or a dog can pull the trigger. At 4200 PSI with a 0° tip fitted, that jet cuts skin.
And the 0° tip is on every one of these eleven machines, with no warning on any of them. A zero-degree nozzle has no fan at all — it carves grooves in decking in one pass and drives mortar out of brickwork. Simpson’s own phrase for the set, “from stripping paint to car cleaning”, is accurate: stripping paint is the 0° and 15° job. Use the 25° for most work and the 40° on anything painted or wooden.
The wand is the one place this listing goes backwards. 16 inches, where the PS60869 at $829.94 and the CRX 4400 at $899.99 both publish 31 inches.
A 31 inch lance cleans a soffit or the top of siding from the ground. Sixteen inches does not. On a machine at $1448.99 that is an omission to know about before ordering, since a longer lance is a separate purchase.
So the trade at the top of the Simpson range is reach against safety — and the safety is the harder thing to add afterwards.
No warranty, and on the most expensive machine on this shelf that is the striking omission. The three Westinghouse machines publish “3-Year Limited Service, Labor, and Parts Coverage with Nationwide Customer Service and Support Network”. All five Simpsons, the DeWalt and the PowerSmart publish nothing.
So the shelf’s cheapest pumps come with three years of cover and its best pump comes with none.
No integrated unloader, which the three smaller Simpsons publish — the valve that diverts flow at the pump when the trigger is released, and the companion to the thermal relief this does have.
No PowerBoost, which the CRX, PS60869 and Aluminum 3600 all claim and none explains.
No soap tank or detergent route — a soap nozzle, and nothing about where the soap comes from. Two Westinghouse machines publish a “Half Gallon Onboard Soap Tank”, which on a machine sold for “construction, equipment upkeep, and facility and fleet maintenance” would be more use than on theirs.
No hose bore, which the two other 50-foot Simpsons publish as 3/8 inch.
No PWMA certification, which only the PowerSmart at $259.99 claims — the single independently verified PSI figure on this shelf, and worth remembering given that one Simpson here is titled 3500 PSI against bullets saying 3300, and another carries a description for a different model.
No fuel tank capacity, which all three Westinghouse listings publish.
And not for sale in California, as with all five Simpsons here.
Read on the day this page was built: $1450 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.
| Pump | CAT triplex plunger with advanced oil seal technology and CERAMIC COATED PISTONS — the only CAT here |
|---|---|
| Engine | Honda GX390 with low-oil shutdown — the largest Honda on this shelf |
| Output | 4200 PSI at 4.0 GPM — 16,800 cleaning units |
| Hose | 50 foot Monster, DUAL-BRAIDED, with a non-marring polyurethane jacket |
| Gun | Professional QC spray gun with a safety lock-out |
| Frame | Aircraft grade aluminum, powder-coated |
| Tires | 13 inch premium pneumatic |
| Weight | 133 lb per the bullet, 56,245 g (1984 oz) per the catalog — which is 124 lb, see the FAQ |
| Dimensions | 38 × 23.5 × 29 inches, published |
| Connection | Threaded M22 |
| Nozzles | Five quick-connect tips with a 16 inch wand |
| Compliance | 49-state — not for sale in California |
| Warranty | Not published |
| Amazon reference | B00U77BYF6 |
| EAN | 0879399001345 |
Seal life, and this is the only listing on the shelf with either. The bullet reads: "4200 PSI 4.0 GPM CAT triplex plunger pump includes thermal relief to prevent overheating; Advanced oil seal technology & ceramic coated pistons extend seal life." The other four Simpsons use AAA triplex pumps, which are already the serviceable kind — against the axial cam pumps on the three Westinghouse machines and the DeWalt, which are sealed and rated in the low hundreds of hours. Cat Pumps is the step above AAA in this market, and the ceramic claim is the specific part: what wears out a triplex pump is the seal riding on the plunger, and a ceramic-coated plunger is harder and smoother than a plated steel one, so it abrades the seal more slowly. That is the component you would otherwise be replacing, and this is the one listing addressing it directly. Whether it doubles the life is not something either of us can verify from a bullet — but it is the right component to be improving, and nothing else here mentions it.
The two figures disagree by nine pounds, and the pattern on this shelf suggests the bullet is high. The bullet publishes "133 lb"; the catalog publishes 56,245 g (1984 oz), which is 124.0 lb. Across the other Simpsons the two sources agree closely: the PS60869 publishes "120 pounds" against a catalog 54,431 g (1920 oz), which is 120.0 lb exactly; the PS61002 publishes 74 lb against 33,021 g (72.8 lb); the PS3228 77 lb against 33,929 g (74.8 lb); the Aluminum 3600 78 lb against 35,834 g (79.0 lb). So four of five match within a couple of pounds, and this one is out by nine. Either reading makes it the second heaviest machine here, behind the CRX 4400 at 61,235 g (2160 oz). What makes it movable is the 13 inch premium pneumatic tires, which the three heaviest Simpsons all use. And the aluminum frame is the one place the weight claim is worth scrutiny: the Aluminum Series 3600 is sold on "cutting weight" and publishes 78 lb against the steel PS3228’s 77 lb.
It is a real downgrade and nothing in the listing explains it. This publishes a "16" spray wand". The PS60869 at $829.94 and the CRX 4400 at $899.99 both publish a "31-inch steel wand/lance" — nearly twice the length. What a long wand buys is reach without a ladder: with a 31 inch lance you clean a soffit or the top of siding from the ground, and with 16 inches you do not. On a machine at $1448.99 delivering 4200 PSI, that is the kind of omission worth knowing before ordering, because a replacement lance is a separate purchase. What this listing has instead, and the two long-wand Simpsons do not, is a safety lock-out on the gun — which only this and the Aluminum Series 3600 publish on this shelf, and which matters a great deal at 4200 PSI with a 0° tip fitted. So the trade is reach against safety, and the safety is the harder part to add later.
Measured against the median of its own aisle here — not against everything on sale.
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 | Pump | Engine | Hose | Tires |
|---|---|---|---|---|---|
| Simpson ALH4240 | $1450 | CAT triplex plunger with advanced oil seal technology and CERAMIC COATED PISTONS — the only CAT here | Honda GX390 with low-oil shutdown — the largest Honda on this shelf | 50 foot Monster, DUAL-BRAIDED, with a non-marring polyurethane jacket | 13 inch premium pneumatic |
| Simpson 60843 | $900 | AAA industrial triplex plunger with thermal relief and PowerBoost | CRX 420cc — Simpson’s own, not a Honda, see the FAQ | 3/8 inch by 50 foot Monster with quick connect fittings and a polyurethane jacket | 13 inch premium pneumatic |
| Simpson PS60869 | $830 | AAA industrial triplex plunger with thermal relief, direct drive | Honda GX270 — a real Honda, where the dearer CRX uses a house engine | 3/8 inch by 50 foot Monster, kink and abrasion-resistant | 13 inch premium pneumatic |
| Simpson 60689 | $730 | AAA triplex plunger with an integrated unloader, thermal relief and PowerBoost | Honda GX200 with low-oil shutdown | 35 feet, Morflex 5/16 inch, non-marring and abrasion-resistant | 10 inch premium pneumatic |
Details checked on October 4, 2026.
Daily use, where the pump outlasting the machine is the whole point
Amazon reports what buyers took in the month before this page was last checked: at least 100.
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
