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🚿 Upgrade your clean game—power, precision, and longevity in one pump!
The AAA 4000 PSI 3.5 GPM Horizontal Replacement Pressure Washer Pump Kit (model 90039) is a robust, easy-to-install pump designed for gas-powered pressure washers with horizontal engines and 1" shafts. Featuring PowerBoost Technology, a sight glass for oil monitoring, and durable brass construction with oversized bearings, it delivers professional-grade cleaning power while extending your machine’s lifespan. Compatible with standard SAE bolt patterns and quick-connect hoses, this pump is the smart, cost-effective upgrade for efficient, high-pressure cleaning.

















| ASIN | B00TQLMPM0 |
| Best Sellers Rank | #67,469 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #34 in Pressure Washer Pumps |
| Brand | AAA |
| Brand Name | AAA |
| Color | Metallic |
| Customer Reviews | 4.2 out of 5 stars 252 Reviews |
| Flow Rate | 3.5 gpm |
| Global Trade Identification Number | 00879399002090 |
| Included Components | Pump Kit |
| Item Dimensions L x W x H | 11"L x 11"W x 7.5"H |
| Item Type Name | Replacement Pressure Washer Pump Kit, 4000 PSI, 3.5 GPM, 1" Shaft, Includes Hardware and Siphon Tube, for Industrial Gas Powered Machines |
| Item Weight | 14 pounds |
| Manufacturer | Simpson |
| Manufacturer Part Number | 90039 |
| Manufacturer Warranty Description | 1 Year Warranty |
| Material | Brass |
| Material Type | Brass |
| Model Number | 90039 |
| Number of Items | 1 |
| Number of Packs | 1 |
| Power Source | Gas Powered |
| Product Dimensions | 11"L x 11"W x 7.5"H |
| Product Style | 4000 PSI at 3.5 GPM |
| Specific Uses For Product | pressure_washing, cleaning_vehicles, cleaning_hard_surfaces |
| Style | 4000 PSI at 3.5 GPM |
| UPC | 879399002090 |
| Unit Count | 1 Count |
T**H
Exact replacement
Exact replacement, just as described, well packaged, & ready to bolt on and go!
G**N
Works good
As strong as the original
J**C
Do not buy lasted only a few washes
This is the exact same factory replacement for my wall pressure washer. The first one last to be 4 1/2 years using it a few times a week to clean off our cars and atvs. I decided to go with the exact same brand and model hoping I can get another 4 to 5 years. I’ve had this for one year now, and I installed the three months after receiving it. And only use a pressure washer a total of five times. To wash my vehicles so in reality it’s only been on for a few months. I know everyone’s gonna ask. Yes I put the correct type of oil. Yes, I’ve put the right amount of oil but the issue I have is the seals internally started leaking even used with cold water. It’s never been run dry. And now I need to buy another head because there’s water in the oil and the head’s making a loud noise again I do not recommend buying these on Amazon. I guarantee you there’s some defective ones or maybe they’re just fake clones. We’re not even getting a few months out of a pressure washer and I spent couple hundred dollars crap stay away from this. I will upload the pictures to show where the water is leaking through it which is just crazy.
A**R
Works perfectly on my pressure washer.
I forgot just how powerful this pump produces water pressure, mine has been going out so long that it surprise me with sower arms. Last pump, exactly the same lasted 7 years with periodic usage.
E**A
Great product
It was great
S**T
So far, not a good experience
Pump was delivered on 6/1/2019. Pump seemed t be well built externally. Installed on 6/2/2019. Installed easily. Test ran after installation. Pumped worked great, until the unloader failed about a minute into the test run. Again the pump cleaned great, but with the unloader not working it killed the engine immediately after releasing wand trigger. Since the unloader is a trivial part, I decided to go the warranty route instead of returning. I called support, they told me to take to local warranty center, a local outdoor equipment company. I took pressure washer to them on 6/4/2019. They diagnosed the problem in agreement with me. They advised me a week later that type company was sending an entire manifold for the pump. Several days later I was advised the wrong part was sent. Yesterday I went to the shop to get as status on 6/25/2019. Replacement part not in yet. So, I bought the pump so I would no longer need to fight my old one and could get my summer projects done. I purchased pump at av wonderful price, got to use it for a few minutes, a month has passed with no pump and no definite end in sight. Update: July 1st....2nd replacement part not yet delivered to warranty center... still without my pressure washer.
C**E
Thanks
Power washer
M**L
Bomba máquina de presión
Muy útil y le funcionó a la máquina de presión 💯
R**Z
Perfect no more words
Perfect, good steady preassure easy to ensambly
D**O
Won’t last long. Buyer beware!
Internally pump is disintegrating after only a few uses. Oil full of metal particles. I don’t see this pump lasting very much longer. Wasted 500 bucks. I absolutely do not recommend this product.
Trustpilot
1 week ago
2 weeks ago