{"product_id":"simpson-aaa-replacement-pressure-washer-pump-4400-psi-4-0-gpm-horizontal-1-shaft-stainless-unloader","title":"SIMPSON AAA Replacement Pressure Washer Pump 4400 PSI 4.0 GPM — Horizontal 1\" Shaft, Stainless Unloader","description":"\u003cp\u003e\u003cstrong\u003eThe SIMPSON 90034 AAA triplex replacement pump delivers up to 4400 PSI at 4.0 GPM for horizontal-shaft gas pressure washers, offering a durable, easy-to-fit solution to restore high-performance cleaning.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis pump kit is engineered as a direct replacement for many gas-powered pressure washers that use a horizontal engine with a 1\" shaft, including common models driven by engines like the Honda GX390. Built with heavy-duty internals and an integrated stainless steel unloader, the 90034 focuses on reliable flow and pressure while minimizing engine drag. It installs in minutes on compatible units and includes features intended to extend service life and simplify maintenance.\u003c\/p\u003e\n\n\u003ch3\u003eHow does the 90034 improve everyday cleaning power?\u003c\/h3\u003e\n\u003cp\u003eThe pump boosts nozzle pressure and maintains consistent flow so you can remove dirt, mildew, and grime more efficiently. PowerBoost technology amplifies force at the tip while an adjustable knob lets you dial pressure down for gentler tasks.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDelivers up to 4400 PSI and 4.0 GPM for heavy-duty cleaning\u003c\/li\u003e\n  \u003cli\u003eAdjustable hand knob for lower-pressure tasks\u003c\/li\u003e\n  \u003cli\u003ePowerBoost increases effective nozzle pressure for quicker cleaning\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill the pump fit my pressure washer and how hard is installation?\u003c\/h3\u003e\n\u003cp\u003eThe 90034 uses an SAE-standard bolt pattern and a 1\" horizontal engine shaft, so compatibility hinges on matching orientation, shaft diameter, and the unit's inlet\/outlet layout. Installation is straightforward for most mechanically inclined users; basic hand tools and alignment checks are usually all that's required.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eFits many gas units with horizontal engines and 1\" shaft\u003c\/li\u003e\n  \u003cli\u003eStandard garden-hose inlet and quick-connect high-pressure outlet\u003c\/li\u003e\n  \u003cli\u003eConfirm shaft size, bolt pattern, and inlet\/outlet orientation before purchase\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat design features support durability and easier maintenance?\u003c\/h3\u003e\n\u003cp\u003eDurable components reduce friction and wear while maintenance-friendly features let you monitor and preserve lubrication without hassle. The pump includes oversized ball bearings, a sight glass for oil visibility, and a stainless integrated unloader to protect the engine during bypass.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDual oversized ball bearings for reduced wear and long service life\u003c\/li\u003e\n  \u003cli\u003eSight glass eliminates the need for a dipstick and shows oil condition\u003c\/li\u003e\n  \u003cli\u003eStainless steel integrated unloader with easy-start functionality\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhich hoses and accessories are compatible with this replacement pump?\u003c\/h3\u003e\n\u003cp\u003eThe pump accepts standard garden-hose feed lines and quick-connect high-pressure outlets so it pairs with a wide range of common pressure-washer hoses and fittings. SIMPSON lists compatibility with several of its own hose lines, but many third-party quick-connect hoses will work as well.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eGarden-hose inlet for convenient water supply connection\u003c\/li\u003e\n  \u003cli\u003eQuick-connect high-pressure outlet for standard pressure hoses\u003c\/li\u003e\n  \u003cli\u003eWorks with several SIMPSON hoses like Armor and Monster series\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: The SIMPSON 90034 AAA Professional Triplex Pump is aimed at homeowners, contractors, and rental shops that need to restore or upgrade a gas pressure washer with a horizontal 1\" shaft. Choose this kit if you want higher cleaning performance, easy maintenance, and durable components that stand up to frequent, heavy-duty use—provided your machine's shaft orientation and connections match the pump specifications.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Does this pump fit vertical-shaft engines?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: No. The 90034 is designed for horizontal engines with a 1\" shaft. Check your engine orientation before ordering.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: How do I know when to change the pump oil?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Use the built-in sight glass to check level and clarity; cloudy oil indicates water contamination or need for replacement.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"SIMPSON","offers":[{"title":"Default Title","offer_id":56806044139860,"sku":"B01D4X0CCK","price":531.95,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/1063\/2652\/4244\/files\/simpson-pump-front-view.jpg?v=1786812432","url":"https:\/\/gardenluxe.co.uk\/products\/simpson-aaa-replacement-pressure-washer-pump-4400-psi-4-0-gpm-horizontal-1-shaft-stainless-unloader","provider":"Gardenluxe Uk","version":"1.0","type":"link"}