Our take
The WB4200 is a documented high-flow, gas-powered contractor model whose 50-foot hose, belt drive, and pneumatic tires make the setup clear. It is a large 49-state unit, so site, transport, and jurisdiction matter as much as output.
A documented contractor-oriented model for users who need a gasoline setup, listed 4.0 GPM flow, and a long steel-braided hose..
Look elsewhere if you need an electric or battery washer, a lighter machine, a California-shippable unit, or a confirmed match to the old Amazon offer.
Pros & cons
What could work for you, and what to consider before buying.
What works in its favor
- SIMPSON's product sheet identifies part 60205 and documents a 4,200 PSI rating, 4.0 GPM flow rating, and Honda GX390.
- A 50-foot steel-braided hose, belt-driven AAA triplex pump, and 13-inch pneumatic tires are listed for the WB4200.
- The manufacturer gives exact dimensions, weight, and professional-use examples rather than relying on the historical title alone.
What to weigh up
- At 159 lb and 46 × 26 × 25 inches, it needs substantial storage and transport planning.
- The 49-state Honda configuration is not shipped to California, so the stated model is not suitable for every buyer's location.
- The checked sources do not map the historical ASIN to an exact current offer or confirm that every accessory in old titles is included.
Specifications and exact model details
The key details
| Model covered | WB4200 (part 60205) |
|---|---|
| Power source and motor | Gasoline; Honda GX390 engine with low-oil shutdown; 49-state configuration. |
| Pressure and listed flow | 4,200 PSI pressure rating and 4.0 GPM flow rating. |
| Pump and hose | AAA triplex pump with belt drive; 3/8-inch by 50-foot steel-braided hose. |
| Nozzles and water setup | Four quick-connect nozzle tips are listed in the official product sheet; check current box contents. |
| Mobility and storage | 13-inch pneumatic tires; manufacturer lists 159 lb and 46 × 26 × 25 inch dimensions. |
| Documented work uses | SIMPSON describes the Water Blaster for professional deck, wood-restoration, paint-preparation, and graffiti-removal work. |
| Variant and market notes | The official product page says 49-state compliant and does not ship to California; historical ASIN/package mapping is not established. |
Performance figures are manufacturer claims. Source checked October 16, 2026. Regional models and included accessories can differ.
Full review: how the features affect your choice
What the features mean for you
Pressure and flow rating
SIMPSON's product sheet identifies the WB4200 as part 60205 and lists a 4,200 PSI pressure rating with a 4.0 GPM flow rating. Preserve the word rating when comparing it with models whose manuals separate rated and maximum operation. These figures define the manufacturer's published model specification; they do not report a controlled cleaning-time comparison. The product sheet ties the values to a Honda GX390 version, which helps distinguish it from other Water Blaster models and part numbers. Check the engine and pump labels on the actual unit before buying, especially if a seller uses the shorter 60205 number without the WB4200 name.
Gas engine and work-site fit
This WB4200 uses a Honda GX390 gas engine with a low-oil shutdown feature, and SIMPSON describes the series for professional work such as deck cleaning, wood restoration, paint preparation, and graffiti removal. That points to a different setup from a household corded washer: plan for fuel, outdoor operation, engine maintenance, and the location where exhaust can be managed safely. The manufacturer identifies this particular Honda configuration as 49-state compliant and explicitly says it does not ship to California. Verify local requirements and the exact engine variant with the seller instead of treating every Water Blaster model as interchangeable.
Pump, drive, and hose reach
The official part sheet lists an AAA triplex pump and belt drive, plus a 3/8-inch by 50-foot steel-braided hose. The hose length can reduce how often an operator has to move the cart around a large work area, while the belt-drive and triplex labels help a buyer compare the documented construction with another professional unit. The source does not give a measured durability result, so these features should be read as design details, not a guarantee of life or output under every duty cycle. Check fittings and replacement-hose compatibility before combining it with accessories from a different SIMPSON model.
Nozzles, tires, and moving the washer
SIMPSON lists four quick-connect nozzle tips and 13-inch premium pneumatic tires. The official sheet also gives 159 pounds and dimensions of 46 × 26 × 25 inches. Those details help with planning a trailer, loading ramp, storage bay, and movement over uneven ground, but the weight makes frequent lifting a poor fit. The included nozzle set is a model-level package description; inspect the current box before relying on every tip being present. Pneumatic tires may help roll the cart across rougher surfaces, though the source does not establish a safe stair-climbing method or a substitute for securing the machine during transport.
Professional use and purchase variant
SIMPSON positions the Water Blaster line for contractors who handle more demanding surfaces and service work. That makes this model a plausible comparison for an operator seeking listed flow and hose reach, but the decision still depends on water supply, nozzle choice, local rules, and transport. The historical candidate row names part 60205 and the Honda GX390, yet its Amazon ASIN does not independently prove the current offer or every package detail. The link therefore searches for WB4200 and part 60205 with the affiliate tag. Confirm the engine, part number, warranty, and 49-state limitation with the seller before purchase.
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Before you buy
What is the WB4200's listed flow?
SIMPSON lists a 4.0 GPM flow rating for the WB4200 part 60205. Keep that rating label distinct from maximum-flow figures in other manuals.
Does this model ship to California?
The checked SIMPSON product sheet identifies the Honda GX390 WB4200 as 49-state compliant and says it does not ship to California. Confirm the exact engine variant and current rules.
Does the review confirm the old Amazon ASIN?
No. SIMPSON's documentation confirms the model and part number, but it does not map the historical ASIN to a current offer. The purchase link searches by model and part number.
Where can I check the current price?
Use the Amazon link for current offers. Check the exact model, seller, product condition, delivery, and return terms. This page does not display a live price or confirm stock.
Sources and review basis
Sources & review basis
We use the linked product documentation for the features above. Our suitability notes and buying advice are editorial judgments based on those features, not measured performance results.
- SIMPSON WB4200 Product Sheet, part 60205 ↗ — checked October 16, 2026.
- SIMPSON Water Blaster manufacturer page ↗ — checked October 16, 2026.
- SIMPSON Industrial Catalog 2026 ↗ — checked October 16, 2026.
Is it the right fit?
Check the exact model and today’s offers on Amazon.