You know a Simpson pressure washer can handle tough jobs, but without the right parts it can quickly lose its edge. A thermal relief valve shields the engine from overheating, while a boost valve kit restores that extra punch you rely on. Replacing the crankcase vent cap prevents costly pump damage, and a fresh pump manifold keeps flow steady. Add a reliable chemical injector set and a filtered hose pickup, and you’ll be set for any cleaning challenge. Ready to see which component matters most?
| Simpson Pressure Washer Thermal Relief Valve Replacement |  | Essential Protection | Compatibility: Simpson pressure washer models (list of 34 model numbers) | Material: High‑quality durable material (metal) | Installation: Simple replacement, threaded 1/4″ NPT | VIEW LATEST PRICE | Read Our Analysis |
| Simpson OEM Pressure Washer Boost Valve Kit |  | Performance Boost | Compatibility: AAA, Delco, DeWalt, Excell, OEM Solutions, Simpson | Material: Brass (durable high‑quality) | Installation: Simple and fast installation, threaded connection | VIEW LATEST PRICE | Read Our Analysis |
| Simpson Crankcase Vent Cap Replacement (7111013) |  | Pressure Relief | Compatibility: Simpson pump models (list of 19 model numbers) | Material: Metal (standard crankcase vent) | Installation: Easy installation, threaded | VIEW LATEST PRICE | Read Our Analysis |
| Pressure Washer Pump Manifold Replacement Kit (7108366) |  | Comprehensive Kit | Compatibility: Simpson OEM models 510020, 520006 | Material: High‑quality metal | Installation: Easy one‑piece installation | VIEW LATEST PRICE | Read Our Analysis |
| Tool Daily Chemical Injector Set for Pressure Washer |  | Compact Injector | Compatibility: Pump models 190593GS, 190635GS, 203640GS | Material: Brass | Installation: Tool‑free removal, 13 mm wrench tighten | VIEW LATEST PRICE | Read Our Analysis |
| Chemical Injector Kit for Pressure Washer (1/8″ 27 Male BSP) |  | Versatile Injector | Compatibility: Pump models 190593GS, 190635GS, 203640GS, 308452002 | Material: Brass | Installation: Simple drop‑in ball and spring, no overtightening | VIEW LATEST PRICE | Read Our Analysis |
| Simpson Cleaning Soap Hose Pickup with Filter |  | Soap Delivery | Compatibility: Simpson and other pressure washer pumps (generic) | Material: Plastic | Installation: Direct replacement, no special tools | VIEW LATEST PRICE | Read Our Analysis |
More Details on Our Top Picks
Simpson Pressure Washer Thermal Relief Valve Replacement
If you own any of the listed Simpson gas‑powered washers, the 7101359 thermal relief valve is the perfect replacement—its 1/4‑inch NPT thread fits every model from 510020 to 540006, and it safely vents hot water to protect seals and internal components. This valve stops overheating by releasing hot water from the pump, letting cool water flow in through the inlet, and it handles up to 200 PSI inlet pressure. Made from durable, wear‑resistant material, it measures 1.7 inches and fits the AP3119462, 10378947, 740592, and 21783 pump series. Amazon offers a 30‑day return guarantee and standard warranty support.
- Compatibility:Simpson pressure washer models (list of 34 model numbers)
- Material:High‑quality durable material (metal)
- Installation:Simple replacement, threaded 1/4″ NPT
- Valve Type:Pressure relief valve
- Thread Size / Connection:1/4″ NPT
- Warranty / Return Policy:Amazon 30‑day return, warranty available
- Additional Feature:1.7‑inch overall length
- Additional Feature:200 PSI max inlet pressure
- Additional Feature:High‑temperature water release
Simpson OEM Pressure Washer Boost Valve Kit
The Simpson OEM Pressure Washer Boost Valve Kit is the perfect upgrade for anyone who wants a noticeable power boost in their car‑wash or outdoor cleaning setup. This compact, brass‑finished valve slips into the threaded inlet and outlet ports, each 1‑inch NPT, and instantly raises pressure without sacrificing durability. You’ll appreciate the high‑quality, sturdy construction that resists corrosion, and the simple, fast installation that takes minutes. Compatible with AAA, Delco, DeWalt, Excell, OEM Solutions, and Simpson models, it adds two ports for flexible hose routing. Backed by a 30‑day return guarantee and solid 4.4‑star reviews, it’s a reliable, cost‑effective performance enhancer.
- Compatibility:AAA, Delco, DeWalt, Excell, OEM Solutions, Simpson
- Material:Brass (durable high‑quality)
- Installation:Simple and fast installation, threaded connection
- Valve Type:Boost valve
- Thread Size / Connection:1″ NPT inlet/outlet
- Warranty / Return Policy:Amazon 30‑day return, warranty available
- Additional Feature:Brass exterior finish
- Additional Feature:Dual‑port design
- Additional Feature:1‑inch inlet/outlet
Simpson Crankcase Vent Cap Replacement (7111013)
Professional landscapers and DIY enthusiasts alike choose the Simpson Crankcase Vent Cap (7111013) because it reliably releases built‑up pressure, preventing pump damage while keeping installation quick and hassle‑free. This tiny 1 × 0.75 × 0.6‑inch component fits pumps 530006 through 530039, covering both commercial and residential units. Weighing just 1.92 oz, it’s easy to handle and swap without tools or downtime. Users praise its 4.8‑star rating from 32 reviews, noting seamless pressure escape and peace of mind. When you replace a worn cap, you protect the pump, maintain performance, and keep your washer running strong for years.
- Compatibility:Simpson pump models (list of 19 model numbers)
- Material:Metal (standard crankcase vent)
- Installation:Easy installation, threaded
- Valve Type:Crankcase vent cap (pressure release)
- Thread Size / Connection:Standard pump vent thread (unspecified)
- Warranty / Return Policy:Warranty information available (Amazon return)
- Additional Feature:1 × 0.75 × 0.6 in dimensions
- Additional Feature:1.92 oz weight
- Additional Feature:Commercial‑grade pressure release
Pressure Washer Pump Manifold Replacement Kit (7108366)
Owners of Simpson pressure washers who demand reliable, long‑lasting performance will find the Pressure Washer Pump Manifold Replacement Kit (7108366) ideal, because its high‑quality metal construction resists corrosion and seals flawlessly. This kit fits OEM models 510020 and 520006 and replaces the axial cam pump manifold in one piece, so you install it quickly. It includes valves, an unloader, a thermal relief valve, a soap‑injection unit, a garden‑hose inlet, a high‑pressure outlet, and mounting hardware. The 3/4‑inch low‑pressure inlet and M22 high‑pressure outlet match your existing hoses. Rigorous testing and a 24‑month service guarantee keep your washer running strong.
- Compatibility:Simpson OEM models 510020, 520006
- Material:High‑quality metal
- Installation:Easy one‑piece installation
- Valve Type:Thermal relief valve (TRV) + unloader valve
- Thread Size / Connection:3/4″ garden hose inlet, M22 high‑pressure outlet
- Warranty / Return Policy:24‑month quality service, Amazon return
- Additional Feature:Integrated soap injection unit
- Additional Feature:M22 high‑pressure outlet
- Additional Feature:24‑month quality service
Tool Daily Chemical Injector Set for Pressure Washer
If you need a reliable way to inject soap or chemicals into your pressure washer, the Tool Daily Chemical Injector Set delivers a compact, brass‑built solution that fits 1/8‑inch threaded ports and handles up to 3000 psi. The small, 4 × 3 × 0.5‑inch unit weighs just 27 g and includes two ports, check‑valve balls, springs, and O‑rings. It bolts onto BSP/BSPT connections on models like 190593GS, 190635GS, and 203640GS. Replace a faulty injector by removing the hose, loosening the old unit with a 13 mm wrench, cleaning the receptacle, inserting the ball bearing and spring, then tightening—never overtighten. The package also supplies brass barbs for secure hose attachment.
- Compatibility:Pump models 190593GS, 190635GS, 203640GS
- Material:Brass
- Installation:Tool‑free removal, 13 mm wrench tighten
- Valve Type:Check valve (chemical injector)
- Thread Size / Connection:1/8″ BSP (barb inlet)
- Warranty / Return Policy:Amazon 30‑day return, warranty available
- Additional Feature:3000 PSI maximum pressure
- Additional Feature:Small 4 × 3 × 0.5 in size
- Additional Feature:Includes 2 check‑valve balls
Chemical Injector Kit for Pressure Washer (1/8″ 27 Male BSP)
The chemical injector kit is ideal for anyone who wants faster, easier cleaning with a Simpson pressure washer, because its brass fitting and 1/8‑inch 27‑male BSP thread snap onto most pumps without hassle. You’ll find two brass fittings, two springs, two balls, and two O‑rings in the box, letting you replace pump models 203640GS, 308452002, 190593GS, and 190635GS in minutes. Install by dropping a ball into each fitting, positioning the spring against it, then re‑attach the fitting—just don’t overtighten. The check‑valve design delivers soap directly to the spray tip, cutting cleaning time. With a compact 0.51 × 0.51 × 0.94‑inch size and 30‑day return guarantee, it’s a reliable, low‑cost upgrade.
- Compatibility:Pump models 190593GS, 190635GS, 203640GS, 308452002
- Material:Brass
- Installation:Simple drop‑in ball and spring, no overtightening
- Valve Type:Check valve (chemical injector)
- Thread Size / Connection:1/8″ BSP (male)
- Warranty / Return Policy:Amazon 30‑day return, warranty available
- Additional Feature:4‑port configuration
- Additional Feature:Compact 0.51 × 0.51 × 0.94 in size
- Additional Feature:Brass fitting with 27 male BSP thread
Simpson Cleaning Soap Hose Pickup with Filter
Professional cleaners and DIY enthusiasts alike will appreciate the Simpson Cleaning Soap Hose Pickup with Filter because it lets you run soap directly through your pressure washer without hassle. This genuine Simpson part fits most Simpson pumps and many other brands, so you can swap it in quickly. The white plastic pickup includes a built‑in filter that prevents clogs, letting you maintain steady foam flow for commercial or residential jobs. We it weighs only 0.15 kg, it won’t strain your machine, and it saves you time and money by protecting the pump. Amazon offers a 30‑day return guarantee and the product carries a standard warranty.
- Compatibility:Simpson and other pressure washer pumps (generic)
- Material:Plastic
- Installation:Direct replacement, no special tools
- Valve Type:Soap hose pickup (filter) – not a valve but a flow control component
- Thread Size / Connection:Standard soap hose pickup thread (unspecified)
- Warranty / Return Policy:Amazon 30‑day return, warranty available
- Additional Feature:White plastic construction
- Additional Feature:Includes built‑in filter
- Additional Feature:Lightweight 0.15 kg weight
Factors to Consider When Choosing Parts for Simpson Pressure Washer
When you pick a part, first make sure it matches your washer’s model and connections. Next, check that the material can handle the job and that its pressure rating meets your cleaning needs. Finally, verify the thread size is standard and that installation will be straightforward.
Compatibility Compatibility
Because pressure washers rely on tightly matched components, you must verify that each part fits your specific Simpson model before buying. First, locate the model number on the frame or manual; it tells you which pump, motor, and hose sizes the machine uses. Cross‑check that part numbers on the retailer’s site match those in your manual or on the original component. Pay attention to thread types—Simpson often uses ¼‑inch NPT for fittings, but some high‑pressure units require ½‑inch. Verify voltage and amperage ratings for electrical parts; a mismatched motor can overload the system. Finally, confirm that any aftermarket accessory, such as a spray wand or nozzle, is rated for the same PSI and GPM as your washer. This diligence prevents costly damage and keeps performance ideal.
Material Durability
Choosing parts made from brass, stainless steel, or high‑grade plastics guarantees they can endure the intense pressure and constant wear of a Simpson washer. Those materials resist corrosion, so you won’t battle rust‑induced leaks or premature failure. Look for reinforced seals and gaskets crafted from durable elastomers; they keep the system airtight and stop drips under load. Heavy‑duty construction—thicker walls and reinforced connections—means the component can survive the rigors of daily use without cracking or warping. Manufacturers that subject parts to rigorous testing and strict quality control give you confidence in longevity and reliable performance. Prioritizing these material qualities protects your investment and keeps your pressure washer operating at peak efficiency.
Pressure Rating
Pressure rating is the key metric that determines whether a replacement part can securely handle your Simpson washer’s 1,500‑3,000 PSI output. When you shop for hoses, seals, or nozzles, check the rating printed on the part and make certain it meets or exceeds the washer’s maximum pressure. A component rated lower than 1,500 PSI risks bursting, leaking, or damaging the pump, which can cost you time and money. High‑quality parts engineered for the exact pressure range preserve performance and extend service life. Always verify the rating before buying, and opt for parts that match the 3,000 PSI ceiling if you run your washer at full power. This simple check guarantees compatibility, safety, and reliable operation.
Thread Size Standardization
Typically, Simpson pressure washers use a standardized 1/4‑inch × 28‑thread (NPT) for most accessories, while the high‑pressure hose fittings often employ a 3/8‑inch × 16‑thread (NPT) or a quick‑connect system. When you pick replacement parts, verify that the thread matches these dimensions; mismatched threads cause leaks and damage. Check whether the component is NPT‑tapered or straight‑thread, because NPT requires pipe‑dope or PTFE tape for a seal. For quick‑connects, guarantee the coupling style (push‑to‑connect or lever‑lock) aligns with your hose. Remember that stainless‑steel threads resist corrosion better than brass. Finally, keep a small thread‑gauge handy so you can confirm compatibility before you buy.
Installation Ease
Even if the thread size matches, a part that’s hard to install can turn a quick fix into a weekend project. You should prioritize components that come with simple, straightforward instructions. Look for snap‑in or threaded designs that need only basic tools—you’ll avoid digging through a toolbox for specialty wrenches. Clear, step‑by‑step guides or video tutorials from Simpson help you stay on track and reduce guesswork. Verify that the replacement fits your exact model; a mismatched part can cause leaks or damage during installation. Finally, gauge the time and skill required. If you’re comfortable with basic DIY tasks, choose parts that match your comfort level, ensuring a smooth, successful repair without unnecessary hassle.
Warranty Coverage
When you’re selecting replacement components for your Simpson pressure washer, checking the warranty details first can save you time and money. Most Simpson parts ship with a manufacturer’s warranty that guarantees quality and protects against defects, but the length and scope differ by item. Review each part’s terms and note whether the warranty covers repair or replacement only, not damage from misuse or improper installation. Register the warranty promptly after purchase; many brands require registration to activate coverage. If you’re unsure about a specific part, contact Simpson or an authorized service provider to confirm the exact warranty provisions. Understanding these factors helps you avoid unexpected costs and keeps your washer running reliably.
