6 models in this file
Replacement 3000 PSI Pumps That Fit Simpson Washers
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Simpson pressure washers are common on driveways and at campgrounds because their gas models pair a small horizontal engine with a pump that can blast grime off cars, RVs, boats and trailers. When that pump starts leaking, losing pressure or pulsing, the engine is often still healthy, and swapping the pump is the practical way to get the washer back in service. Most replacement pumps sold for these machines are made by third-party brands to fit Simpson’s engine mounting, not by Simpson itself.
That is the case here: five of the six products are aftermarket pumps from Mikatesi, YAMATIC, VEVOR and Hourleey that list Simpson compatibility, and the sixth is a genuine Simpson 25-foot 4000 PSI hose. The pumps differ mainly in rated pressure and flow, which Simpson models they name, and what installation hardware comes in the box.
The line-up at a glance
Simpson Pressure Washer Pumps Compared
| Product | Made By | Pressure and Flow | Shaft | Simpson Models Named |
|---|---|---|---|---|
| 3/4″ Shaft Horizontal Pressure Washer Pump | Mikatesi | 2600-3000 PSI, 2.5 GPM | 3/4″ horizontal | Simpson in title only |
| YAMATIC Horizontal 3/4″ Shaft Pump | YAMATIC | Up to 3400 PSI, 2.5 GPM | 3/4″ horizontal | MSH3125, MS60753, MS60788, MS60850, MS60799, MS61043 |
| YAMATIC Pressure Washer Pump 3125HO-WFS | YAMATIC | 3100-3400 PSI, 2.5 GPM | 3/4″ horizontal | 90029, 90028, MSH3125, MSH3125-S, 52004, MSH3224, MS60921 |
| VEVOR Horizontal Triplex Pump | VEVOR | 3300 PSI, 3.0 GPM | 3/4″ horizontal | Listed as MorFlex 40224, 40225, 40226 |
| Simpson 25ft Hose 40224 | Simpson | Rated 4000 PSI | Not applicable | M22 fits most washers |
| Hourleey 3/4″ Shaft Horizontal Pump | Hourleey | 3400 PSI, 2.5 GPM | 3/4″ horizontal | Simpson in title only |
No. 1 of 6 · Mikatesi
Mikatesi 3/4″ Shaft Horizontal Pressure Washer Pump for 3000 PSI Washers
8.2/10 Our score
What the listing says
- HIGH-QUALITY PUMP Industry engineering process designed for residential powerful pressure washer cleaning job, longest real 120 hours endurance…
- Easy Start Easy Job – Pre-filled gasoline for a lifetime and no need to change the oil.
- Quick Start & Maintenance-Free : Quick cold starts to make the startup a breeze & Built in for simple &…
- Performance and Quality Upgrades : One of The Longest Lasting Pressure Washer Pumps on The Market, A high -qualitythermal relief…
- COMPATIBALE Replacement for ►HONDA GC190, GC135, GX140,GX160 (GC160 with 3/4" keyway shaft).
- Please feel free to contact us for any technical and afterserivce requirement.
The 3 4″ Shaft Horizontal Pressure Washer pump from Mikatesi is rated 2600 to 3000 PSI at 2.5 GPM, the closest match here to a true Simpson 3000 PSI pump. It is built from die-cast aluminum with a brass outlet, has a thermal relief valve with a protective cap to keep the pump at a safe temperature, and is described as pre-filled for life with no oil changes needed. The listing claims a 120-hour endurance test and an easy-start design that lightens the recoil pull.
The compatibility list names Honda GC190, GC135, GX140 and GX160 engines along with Homelite, Karcher and Powerstroke models, and the title mentions Simpson, but the visible list does not give specific Simpson model numbers. The listing also contains errors: one line says pre-filled gasoline where it clearly means oil, and the model number field reads vertical shaft even though the product is a horizontal shaft pump. Dimensions are listed as 8.1 by 6 by 5 inches.
This pump suits owners whose washer was originally rated around 3000 PSI and 2.5 GPM, who can confirm the bolt pattern and shaft size themselves. If you want a pump that names your exact Simpson model, the YAMATIC options below are more specific.
No. 2 of 6 · Yamatic
YAMATIC Horizontal 3/4″ Shaft Pressure Washer Pump for MSH3125 and MS607xx Models
9.6/10 Our score
Best for: Simpson MSH3125 and MS607xx owners
What the listing says
- Extend Service Life & High Performance Replace this HORIZONTAL 3/4" shaft pump to reborn engine instead of buying a whole new power…
- Fit Guidance (Horizontal, 3/4" Shaft 】SAE standard bolt pattern for many gas pressure washers with horizontal engines, great replacement for ►HONDA…
- TRV Protection & Adjustable Unloader The TRV helps protect the pump from overheating in bypass.
- Fit for Who USA Standard Mounting design, this pump could fit most brand gas power washers come with the…
- Easy Start Easy Job Pre-filled oil (no initial oil change required) and an Easy-Start structure provide easier pull-back starting.
Pros
- Names specific Simpson models
- Adjustable unloader
- Stainless steel pistons
Cons
- Spec fields look unreliable
- Up to 3400 PSI may exceed hose
The YAMATIC Horizontal 3 4″ Shaft Pressure washer pump, model 10P2923HA, produces up to 3400 PSI at 2.5 GPM. It uses stainless steel pistons for seal life, a thermal relief valve to prevent overheating in bypass, a double-seal system, an adjustable unloader and a claimed service life of up to 150 hours. It arrives pre-filled with oil.
Fit guidance is clear: an SAE standard bolt pattern for horizontal engines from about 180 to 225 cc, roughly 6.5 to 7 hp, and named Simpson models MSH3125, MS60753, MS60788, MS60850, MS60799 and MS61043. The listing asks buyers to match engine orientation, PSI and GPM, shaft size and inlet and outlet orientation. Some specification fields are not believable, such as a weight of five hundredths of a pound and a maximum lifting height of 3200 meters, so rely on the feature text instead.
Choose this pump if your Simpson model is on its list. Because it can run above 3000 PSI, check that your hose, gun and nozzles are rated for the higher pressure, or set the adjustable unloader lower.
No. 3 of 6 · Yamatic
YAMATIC Pressure Washer Pump 3/4″ for Simpson 90028 and 90029
8.8/10 Our score
Best for: Simpson 90028 and 90029 owners
What the listing says
- Reborn Your Pressure Washer YAMATIC Horizontal Power Washer Pump 3/4" Shaft MAX 3400 PSI / 2.5 GPM / @3200 RPM,…
- Extended Durability& Adjustable Unloader High-performance double seal system prevents leakage, upgraded technical surfacing piston and bearing, It is manufactured from…
- Maintenance-Free This pump features a maintenance-free crankcase so you never have to change the oil.
- Easy Start Built in for simple & quick cold starts to make the startup a breeze, no need…
- COMPATIBILITY Replacement for►Simpson: 90029, 90028,MSH3125, MSH3125-S, 52004,MSH3224, MS60921.
Pros
- Siphon tube, bolts and key included
- 200-hour running time claim
- Anodized die-cast aluminum
Cons
- Nozzle claim not in kit list
- Won’t fit 7/8-inch shafts
The YAMATIC Pressure Washer Pump 3 4″ shaft horizontal model, 3125HO-WFS, is rated up to 3400 PSI at 2.5 GPM and 3200 RPM, with top performance quoted between 3100 and 3400 PSI for 208 to 220 cc engines of 6.5 to 7 hp. It is made from fully anodized die-cast aluminum, has a double seal system, an upgraded piston and bearing, an adjustable unloader and a maintenance-free crankcase. The listing claims 200 hours of running time.
The named Simpson fits are 90029, 90028, MSH3125, MSH3125-S, 52004, MSH3224 and MS60921, plus Honda GC190 and GC160, Troy-Bilt and Karcher models. The kit includes a siphon tube with filter, mounting bolts, shaft key and an instruction booklet. The item highlight mentions 5 nozzles, but the included-items list does not, so do not count on them. It will not fit a 7/8-inch engine shaft. The weight is listed at 6 pounds, while the 2-inch dimensions are clearly an error.
This is the most complete YAMATIC kit here and the one to pick if your washer is a Simpson 90028 or 90029. For more general troubleshooting, our pressure washer pump guide explains how to tell a failing pump from a clogged nozzle.
No. 4 of 6 · Vevor
VEVOR Horizontal Triplex Pressure Washer Pump for Higher Flow
8.8/10 Our score
Best for: Upgrading flow with a triplex pump
Pros
- 0 GPM flow
- Triplex design
- Brass construction
Cons
- Heaviest pump at 12 pounds
- Very sparse listing
The VEVOR Horizontal Triplex Pressure Washer Pump, model GYB-3, is the only triplex pump in this group. It is rated 3300 PSI at 3.0 GPM with a 3/4-inch shaft, made of brass, and weighs 12 pounds at 9.44 by 7.08 by 5.9 inches. The listing style says no nozzles are included.
The title claims compatibility with Simpson MorFlex models 40224, 40225 and 40226. Be careful here: 40224 is the part number Simpson uses for its 25-foot hose in this same roundup, so those numbers may not be washer model numbers at all. The listing gives no feature text to clarify, so confirm your washer’s model, shaft and bolt pattern before ordering.
A triplex pump uses three pistons and generally runs smoother than the axial cam pumps on most homeowner washers, and higher flow rinses a car or boat faster. The trade-off is weight and fit uncertainty. This pump suits experienced owners who want to upgrade flow and are comfortable checking mounting details. For washers that are already close to this output, see our 3000 PSI power washer roundup.
No. 5 of 6 · Simpson
Simpson 25ft 4000 PSI Hose for a Fresh Connection
8.6/10 Our score
Best for: Replacing a worn washer hose
What the listing says
- Cold Water Compatible The Santoprene series power washer hose is built for water temperatures up to 140 degrees Fahrenheit;…
- Easy Connections This hose includes industry standard M22 threaded hose connections, and can be used with pressure washers…
- Works with Most Pressure Washers: This Santoprene hose is equipped with industry standard threaded M22 connections…
- Quality Construction Dual-braided construction of steel over polyester inner jacket provides strength and durability; the Santoprene outer jacket…
- Durability and Long Life: The 4-inch bend protectors help extend the life of the accessory
Pros
- Genuine Simpson part
- Rated to 4000 PSI
- Steel-braided, kink resistant
Cons
- Cold water only, 140°F max
- 90-day accessory warranty
The Simpson 25ft 1/4-inch Santoprene pressure washer hose, part 40224, is the only genuine Simpson product here. It is rated to 4000 PSI, uses industry standard M22 threaded connections with a dual o-ring design, and comes with an adapter so it can replace your original hose or extend it. Construction is dual-braided steel over a polyester inner jacket with a flexible, abrasion-resistant Santoprene outer jacket and 4-inch bend protectors.
It is a cold water hose rated for water up to 140 degrees Fahrenheit, weighs 3 pounds, and carries a 90-day limited accessory warranty. The listing does not use the MorFlex name, even though that term appears in searches for this part number.
Replacing a pump is a good time to replace a cracked or kinked hose too, especially if the new pump runs up to 3400 PSI. With 4000 PSI of headroom, this hose covers every pump in this list. An extra 25 feet also helps when washing an RV roof or reaching around a trailer without moving the machine.
No. 6 of 6 · Hourleey
Hourleey 3/4″ Shaft Horizontal Pressure Washer Pump for a Complete Mounting Kit
8.0/10 Our score
What the listing says
- Reborn Your Pressure Washer This easy install kit is great for power washers that can support 3400 PSI at 2.5…
- Universal Compatibility With a standard 3/4" shaft, our horizontal pressure washer pump is designed to fit seamlessly into various gas-powered washers.
- Easy Installation Engineered for effortless and quick cold starts, our kit eliminates the need to release pressure before starting the engine.
- Maintenance-Free Pre-filled with oil and equipped with a double seal system, our pump is designed to be…
- High Quality Our pressure washer pump is designed for longevity, enhancing plunger durability to improve resistance against wear…
The Hourleey 3 4″ Shaft Horizontal Pressure washer pump is rated 3400 PSI at 2.5 GPM with a 3/4-inch shaft, a 3/4-inch NH garden hose inlet and an M22 high-pressure outlet. It arrives pre-filled with oil, uses a double seal system, a one-piece pump head and a metal shaft sleeve to guard against oil leaks, and has a maintenance-free crankcase. It weighs 3.22 kg.
The kit is the most fully described here: 1 detergent hose, 4 UNF 5/16-24 by 1 inch bolts, 1 shaft key, 4 D8 flat pads, 4 D8 spring washers and an instruction manual. The title lists Simpson compatibility, but the listing does not give specific Simpson model numbers, and the model number field is generic.
This suits DIYers who value having every bolt and washer in the box. If you need a named Simpson fit, the YAMATIC listings are more specific.
Before you choose
How to Choose the Right Pump for a Simpson Pressure Washer
Match the shaft first. Every pump here is a 3/4-inch horizontal shaft design. If your engine has a 7/8-inch shaft or a vertical shaft, none of them will fit.
Check your model number against named fits. The two YAMATIC listings name specific Simpson models, which is the safest way to buy. The Mikatesi, VEVOR and Hourleey listings mention Simpson more generally.
Match pressure and flow to the engine. A pump rated above your original may overload a small engine or overpressure your hose. The Mikatesi is the closest to a stock 3000 PSI at 2.5 GPM, while the YAMATIC and Hourleey reach 3400 PSI and the VEVOR adds flow at 3.0 GPM.
Budget for hardware. The YAMATIC 3125HO-WFS and Hourleey kits list bolts and a shaft key, while the other listings are less specific. And if you store the washer in an RV bay or trailer over winter, drain the pump and use pump protectant as several listings recommend. A small portable air compressor can help blow residual water out of lines before storage.
Questions people ask
FAQ
Which pump fits my Simpson pressure washer?
Find the model number on your washer’s label and compare it with the named lists. The YAMATIC 10P2923HA names MSH3125 and several MS607xx and MS608xx models, and the YAMATIC 3125HO-WFS names 90028, 90029, MSH3125 and MSH3224.
Are these pumps made by Simpson?
No. The pumps are made by Mikatesi, YAMATIC, VEVOR and Hourleey. Only the 25-foot hose is a genuine Simpson product.
Can I use a 3400 PSI pump on a 3000 PSI Simpson?
The listings say to match PSI and GPM to your washer. Both YAMATIC pumps have adjustable unloaders to lower pressure, and your hose and gun should be rated for the maximum output.
Do these pumps need oil changes?
The Mikatesi, YAMATIC and Hourleey listings describe pre-filled, maintenance-free crankcases. The VEVOR listing does not say.
Is the Simpson 40224 hose a MorFlex hose?
The listing calls it a Santoprene hose and does not mention MorFlex. It is rated to 4000 PSI with M22 connections.
Prices, specifications and the feature lines above are read from the product listing and can change without notice. Scores are out of 10, based on listed specifications and buyer feedback; nothing on this page is written from handling the product.
