--- product_id: 31524716 title: "AAA 90034 Horizontal Triplex Plunger Replacement Pressure Washer Pump Kit, 4400 PSI, 4.0 GPM, 1\" Shaft, Includes Hardware and Siphon Tube, for Industrial Gas Powered Machines, Black" brand: "simpson" price: "AED 2211" currency: AED in_stock: true reviews_count: 9 category: "Simpson" url: https://www.desertcart.ae/products/31524716-aaa-90034-horizontal-triplex-plunger-replacement-pressure-washer-pump-kit store_origin: AE region: United Arab Emirates --- # 4.0 GPM flow rate 4400 PSI max pressure 1" shaft with SAE bolt pattern AAA 90034 Horizontal Triplex Plunger Replacement Pressure Washer Pump Kit, 4400 PSI, 4.0 GPM, 1" Shaft, Includes Hardware and Siphon Tube, for Industrial Gas Powered Machines, Black **Brand:** simpson **Price:** AED 2211 **Availability:** ✅ In Stock ## Summary > ⚡ Upgrade your clean game with power and precision! ## Quick Answers - **What is this?** AAA 90034 Horizontal Triplex Plunger Replacement Pressure Washer Pump Kit, 4400 PSI, 4.0 GPM, 1" Shaft, Includes Hardware and Siphon Tube, for Industrial Gas Powered Machines, Black by simpson - **How much does it cost?** AED 2211 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.ae](https://www.desertcart.ae/products/31524716-aaa-90034-horizontal-triplex-plunger-replacement-pressure-washer-pump-kit) ## Best For - simpson enthusiasts ## Why This Product - Trusted simpson brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Universal SAE Compatibility:** Fits most horizontal gas pressure washers with a 1" shaft—easy swap, no hassle. - • **Durable Dual Oversized Bearings:** Minimize friction and extend pump life in tough industrial conditions. - • **Oil Sight Glass & Advanced Seal:** Instantly monitor oil health without guesswork or dipsticks. - • **Standard Garden Hose & Quick Connect:** Seamlessly integrates with popular pressure washer hoses for versatile use. - • **PowerBoost Technology for Peak Performance:** Delivers higher nozzle pressure for faster, deeper cleaning. ## Overview The AAA 4400 PSI 4.0 GPM Replacement Pressure Washer Pump Kit is a robust, easy-to-install upgrade designed for gas pressure washers with horizontal engines and a 1" shaft. Featuring PowerBoost Technology, dual oversized bearings, and an oil sight glass, it delivers industrial-grade cleaning power while extending your equipment’s lifespan. Compatible with standard SAE bolt patterns and popular hose connections, this pump kit offers a professional-grade solution backed by a 5-year warranty. ## Description Engineered to surpass expectations, the 90034 AAA Professional Triplex Pump is highly efficient and minimizes engine load while delivering top performance. This easy-to-install pump replacement kit is for gas pressure washers* with a horizontal engine and a 1" diameter shaft, such as the Honda GX390. This pump can produce up to 4400 PSI at 4.0 GPM. The 90034 is designed with dual oversized ball bearings to reduce friction and allow for long lasting performance in the toughest cleaning environments. The 90034 features a stainless steel integrated unloader featuring our easy-start system. (*Check your pressure washer's inlet and outlet orientation to ensure compatibility) Review: Powerful Pump – Great Upgrade for My Pressure Washer - I installed this AAA 90034 triplex pump on my gas-powered pressure washer, and it completely transformed the machine. The 4400 PSI and 4.0 GPM output are no joke — it delivers excellent pressure and flow, perfect for heavy-duty cleaning tasks. Installation was straightforward, and it came with everything needed, including the siphon tube and hardware. It runs smooth and feels solidly built. After weeks of use, it’s still performing like new. Definitely worth the price if you’re looking to upgrade or replace a worn-out pump. Review: Fits Dewalt 4200 psi pressure washer - Easy as heck to install, only 4 bolts! There wasn’t even a set screw on the shaft. The old pump was seized onto the drive shaft, had to gently tap it off with a hammer. Didn’t want this to happen again so I made sure to reinstall with anti-seize. Washer is so strong I now worry about blasting paint off of my pickup! Lol! ## Features - Extend the life of your pressure washer: Save money by replacing your pump instead of buying a whole new power washer. This easy-to-install kit is great for power washers that can support 4400 PSI at 4.0 GPM to wash walls, sidewalks, vehicles, and more - Compatibility: SAE standard bolt pattern fits many gas pressure washers with horizontal engines. To ensure compatibility, be sure to match engine orientation, PSI, GPM, engine shaft diameter, and current pump inlet and outlet connection - Adjustable power: Pump includes PowerBoost Technology that delivers higher pressure at the nozzle for a more efficient cleaning experience; There is also a hand turn knob that lets you reduce power at your convenience for tasks that require lower pressure - Know when to change your oil: The sight glass and advanced oil seal technology eliminates the need for a dipstick. With visibility to the oil level and the oil itself, you can easily see when oil levels are low or if water has clouded the oil - Standard Connections: This replacement pump features a garden hose inlet and quick connect high pressure hose outlet; Use it with many pressure washer hoses, including Simpson Armor 41114, 41096, 41115 or Simpson Monster 41113, 41028, 41030, 41032, 41034 ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B01D4X0CCK | | Best Sellers Rank | #87,147 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #40 in Pressure Washer Pumps #1,038 in Pressure Washer Accessories | | Brand | SIMPSON | | Brand Name | SIMPSON | | Color | Black | | Customer Reviews | 3.9 out of 5 stars 273 Reviews | | Flow Rate | 4 Gallons Per Minute | | Global Trade Identification Number | 00879399002335 | | Included Components | Pump Kit | | Item Dimensions L x W x H | 11.5"L x 11.5"W x 11"H | | Item Type Name | Replacement Pressure Washer Pump Kit, 4400 PSI, 4.0 GPM, 1" Shaft, Includes Hardware and Siphon Tube, for Industrial Gas Powered Machines | | Item Weight | 16 Pounds | | Manufacturer | simpson | | Manufacturer Part Number | 90034 | | Manufacturer Warranty Description | 5 year warranty | | Material | Brass , Black Aluminum | | Material Type | Brass, Black Aluminum | | Model Number | 90034 | | Power Source | Gasoline | | Product Dimensions | 11.5"L x 11.5"W x 11"H | | Product Style | 4400 PSI at 4.0 GPM | | Style | 4400 PSI at 4.0 GPM | | UPC | 879399002335 | | Unit Count | 1.0 Count | | Voltage | 120 | ## Product Details - **Brand:** SIMPSON - **Color:** Black - **Material:** Brass - **Style:** 4400 PSI at 4.0 GPM - **Product Dimensions:** 11.5"L x 11.5"W x 11"H - **Power Source:** Gasoline - **Item Weight:** 16 Pounds - **Maximum Flow Rate:** 4 Gallons Per Minute - **Voltage:** 120 - **Global Trade Identification Number:** 00879399002335 ## Images ![AAA 90034 Horizontal Triplex Plunger Replacement Pressure Washer Pump Kit, 4400 PSI, 4.0 GPM, 1" Shaft, Includes Hardware and Siphon Tube, for Industrial Gas Powered Machines, Black - Image 1](https://m.media-amazon.com/images/I/71UfvYTtB6L.jpg) ![AAA 90034 Horizontal Triplex Plunger Replacement Pressure Washer Pump Kit, 4400 PSI, 4.0 GPM, 1" Shaft, Includes Hardware and Siphon Tube, for Industrial Gas Powered Machines, Black - Image 2](https://m.media-amazon.com/images/I/81rCGPKmcTL.jpg) ![AAA 90034 Horizontal Triplex Plunger Replacement Pressure Washer Pump Kit, 4400 PSI, 4.0 GPM, 1" Shaft, Includes Hardware and Siphon Tube, for Industrial Gas Powered Machines, Black - Image 3](https://m.media-amazon.com/images/I/81Zf+oKnljL.jpg) ![AAA 90034 Horizontal Triplex Plunger Replacement Pressure Washer Pump Kit, 4400 PSI, 4.0 GPM, 1" Shaft, Includes Hardware and Siphon Tube, for Industrial Gas Powered Machines, Black - Image 4](https://m.media-amazon.com/images/I/81G0Sx-EA5L.jpg) ![AAA 90034 Horizontal Triplex Plunger Replacement Pressure Washer Pump Kit, 4400 PSI, 4.0 GPM, 1" Shaft, Includes Hardware and Siphon Tube, for Industrial Gas Powered Machines, Black - Image 5](https://m.media-amazon.com/images/I/81xGC9O7ZVL.jpg) ## Available Options This product comes in different **Style** options. ## Questions & Answers **Q: Que medida es el eje o el chaf** A: 1 inch **Q: I have a 13 hp Honda with 4000 psi 3.8gpm cat pump...will this pump mount with same bolt pattern?** A: ABSOLUTELY, no problem. Perfect fit for the GX390, WELL WITHIN SPECS! Better pump choice is the AR RKV45G40HD-F24 4000psi @ 4.5 gpm OR Bertolini WMG 4043 4000psi @ 4.3 gpm ......both superior to the "tipple A" ....Although the "cat" is better quality than all the above in the 4000 @ 4.0 gpm, but pricey! Keep in mind, that when a "pressure washer manufacture" like DeWalt publish a given pressure, it's typically 8% above the actual pressure EVER achievable. The reason for this is a deceiving sales tactic that manufactures like DeWalt take advantage of. The ASTM guidelines on pressure washers allow for a 8% in min/max operating pressures so the pressure washer manufacture (not the pump mfg) takes the MAX pressure the actual pump is capable of producing and multiply by .08 and round down to the next "whole number". The cat pump on you're machine is only capable in the neighborhood of 3800 psi. ANY of the above listed pumps will exceed the performance of your OEM equipment from De Fault! **Q: Will this pull water from a tank?** A: i use a water tank it' in a truck so it's higher than the pump gravity feed **Q: Will this fit dxpw4035 dewalt pressure washer?** A: Technically it would fit on the Honda Engine but this pump required a 13HO GX390 Engine and the DXPW4035 has a GX270 9HP engine. The suggested replacement pump is the 90038 AAA Pump Thank You Allparts Equipment Technical Service Team ## Customer Reviews ### ⭐⭐⭐⭐⭐ Powerful Pump – Great Upgrade for My Pressure Washer *by I***Y on April 12, 2025* I installed this AAA 90034 triplex pump on my gas-powered pressure washer, and it completely transformed the machine. The 4400 PSI and 4.0 GPM output are no joke — it delivers excellent pressure and flow, perfect for heavy-duty cleaning tasks. Installation was straightforward, and it came with everything needed, including the siphon tube and hardware. It runs smooth and feels solidly built. After weeks of use, it’s still performing like new. Definitely worth the price if you’re looking to upgrade or replace a worn-out pump. ### ⭐⭐⭐⭐⭐ Fits Dewalt 4200 psi pressure washer *by J***N on April 19, 2019* Easy as heck to install, only 4 bolts! There wasn’t even a set screw on the shaft. The old pump was seized onto the drive shaft, had to gently tap it off with a hammer. Didn’t want this to happen again so I made sure to reinstall with anti-seize. Washer is so strong I now worry about blasting paint off of my pickup! Lol! ### ⭐ Don’t waste your money *by B***N on April 17, 2025* I own a DeWalt 4400 machine. The original pump lasted me 12 years of heavy use. This pump arrived Feb 9, 2025. I installed it within a week. But it’s winter in Nebraska so I didn’t start using it until April. At first, pressure was fine. I used it for maybe 30 minutes washing off my skid steer machine. Then I took it to a job site. Performance started to decrease within the first ten minutes. I blamed the water pressure. Went to the next job. Same thing. And again I blamed poor water pressure. It’s a new pump. Has to be something else. I didn’t get 2 hours out of this pump. And when you let off the handle and it goes to bypass mode it makes a horrendous noise. But of course, the return window is closed and you can’t talk to who sent the pump. I read the reviews before I purchased and chose to ignore the reviews that said this pump failed quickly. I’m telling you, believe the reviews like mine. This pump is total junk. If you do chose to buy, spend the money on the 3 year protection plan. You’ll need it. $300 education to buy local from someone you can talk to. ## Frequently Bought Together - AAA 90034 Horizontal Triplex Plunger Replacement Pressure Washer Pump Kit, 4400 PSI, 4.0 GPM, 1" Shaft, Includes Hardware and Siphon Tube, for Industrial Gas Powered Machines, Black - Valley Industries Pressure Washer Premium Pump Oil - 1 Liter, Black, (PK-85490000) - Northstar Pressure Washer Pressure Gauge - 5000 PSI, 3/8in. 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