--- product_id: 768128280 title: "SIMPSON Cleaning 90037 Triplex Plunger Horizontal Pressure Washer Replacement Pump 8.7GA12 3400 PSI @ 2.5 GPM with Brass Head and PowerBoost Technology" brand: "simpson" price: "£53.45" currency: GBP in_stock: false url: https://www.desertcart.co.uk/products/768128280-simpson-cleaning-90037-triplex-plunger-horizontal-pressure-washer-replacement-pump store_origin: GB region: United Kingdom --- # 2.5 GPM flow rate 3400 PSI max pressure Forged brass head durability SIMPSON Cleaning 90037 Triplex Plunger Horizontal Pressure Washer Replacement Pump 8.7GA12 3400 PSI @ 2.5 GPM with Brass Head and PowerBoost Technology **Brand:** simpson **Price:** £53.45 **Availability:** ❌ Out of Stock ## Summary > 🚀 Elevate your clean game with SIMPSON’s powerhouse pump! ## Quick Answers - **What is this?** SIMPSON Cleaning 90037 Triplex Plunger Horizontal Pressure Washer Replacement Pump 8.7GA12 3400 PSI @ 2.5 GPM with Brass Head and PowerBoost Technology by simpson - **How much does it cost?** £53.45 with free shipping - **Is it available?** Currently out of stock - **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/768128280-simpson-cleaning-90037-triplex-plunger-horizontal-pressure-washer-replacement-pump) ## 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 - • **Built to Last:** Forged brass head and black anodized aluminum crankcase for rugged, corrosion-resistant durability. - • **User-Friendly Design:** Pre-filled oil, oversized sight glass, and adjustable unloader make maintenance effortless. - • **PowerBoost Technology:** Turbocharge your cleaning with patent-pending PowerBoost for unmatched pressure performance. - • **Universal Compatibility:** Fits most gas pressure washers with a threaded M22 outlet and SAE flange. - • **Precision Ceramic Pistons:** Polished ceramic-coated pistons ensure longer seal life and peak efficiency. ## Overview The SIMPSON 90037 Triplex Plunger Pump delivers 3400 PSI at 2.5 GPM with a durable forged brass head and PowerBoost Technology, ensuring superior cleaning power and longevity. Designed for universal fitment and easy maintenance, it’s the professional’s choice for high-performance gas pressure washers. ## Description Whether youre looking for a * part or an accessory to enhance your cleaning experience, SIMPSON has the right one for you! Our accessories provide more cleaning options for the homeowner and professional to get the job done effectively while efficiently. Our accessories are designed to fit most gas pressure washers. ## Features - Direct drive horizontal pump, forged brass head, black anodized aluminum crankcase, 3/4"shaft, thermal relief valve, SAE gas engine flange, threaded M22 pump outlet connection - Universal to fit most brands/models - Precision polished ceramic coated pistons for improved seal life, dual oversized radial ball bearings for better wear and friction resistance, and integrated unloader with easy-start feature - Pre-sealed and pre-filled with oil in the pump and oversized site glass does away with the need for a dipstick - Patent Pending PowerBoost Technology to enhance cleaning performance. Has an Adjustable Unloader ## Technical Specifications | Specification | Value | |---------------|-------| | Brand | SIMPSON | | Colour | Black | | Material | Brass | | Style | Adjustable,Thermal | | Product Dimensions | 30.5L x 22.9W x 10.2H Centimeters | | Power Source | Gas Powered | | Item Weight | 9 Pounds | | Maximum Flow Rate | 2.5 Gallons Per Minute | | Maximum Lifting Height | 866.14 Inches | | Voltage | 120 | | Global Trade Identification Number | 00879399002076, 08793990020760 | | Manufacturer | SIMPSON Cleaning | | UPC | 879399002076 | | Item model number | 90037 | | ASIN | B00TQLMNMC | ## Product Details - **Brand:** SIMPSON - **Colour:** Black - **Material:** Brass - **Style:** Adjustable,Thermal - **Product Dimensions:** 30.5L x 22.9W x 10.2H Centimeters - **Power Source:** Gas Powered - **Item Weight:** 9 Pounds - **Maximum Flow Rate:** 2.5 Gallons Per Minute - **Maximum Lifting Height:** 866.14 Inches - **Voltage:** 120 ## Images ![SIMPSON Cleaning 90037 Triplex Plunger Horizontal Pressure Washer Replacement Pump 8.7GA12 3400 PSI @ 2.5 GPM with Brass Head and PowerBoost Technology - Image 1](https://m.media-amazon.com/images/I/71Dz7TCDcgL.jpg) ![SIMPSON Cleaning 90037 Triplex Plunger Horizontal Pressure Washer Replacement Pump 8.7GA12 3400 PSI @ 2.5 GPM with Brass Head and PowerBoost Technology - Image 2](https://m.media-amazon.com/images/I/81mRmUe4IqL.jpg) ![SIMPSON Cleaning 90037 Triplex Plunger Horizontal Pressure Washer Replacement Pump 8.7GA12 3400 PSI @ 2.5 GPM with Brass Head and PowerBoost Technology - Image 3](https://m.media-amazon.com/images/I/81xNEzOYxoL.jpg) ![SIMPSON Cleaning 90037 Triplex Plunger Horizontal Pressure Washer Replacement Pump 8.7GA12 3400 PSI @ 2.5 GPM with Brass Head and PowerBoost Technology - Image 4](https://m.media-amazon.com/images/I/81MQ2YwMLXL.jpg) ![SIMPSON Cleaning 90037 Triplex Plunger Horizontal Pressure Washer Replacement Pump 8.7GA12 3400 PSI @ 2.5 GPM with Brass Head and PowerBoost Technology - Image 5](https://m.media-amazon.com/images/I/81g1jEUGM1L.jpg) --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.co.uk/products/768128280-simpson-cleaning-90037-triplex-plunger-horizontal-pressure-washer-replacement-pump](https://www.desertcart.co.uk/products/768128280-simpson-cleaning-90037-triplex-plunger-horizontal-pressure-washer-replacement-pump) --- *Product available on Desertcart United Kingdom* *Store origin: GB* *Last updated: 2026-05-30*