TOOLCY Pressure Washer Pump triplex 1" Shaft 4400 PSI 4 GPM – 9–15 HP Horizontal Mount, anodized crankcase

TOOLCY's triplex pressure washer pump replaces worn-out units to restore up to 4400 PSI and deliver 4 GPM cleaning power with a 1" drive shaft.

This heavy-duty replacement pump is built for horizontal engine mounting on 9–15 HP gas power washers. Its anodized crankcase and solid brass pump head improve durability while a sight glass and advanced oil seals simplify maintenance. Designed for cold-water use, it fits common engines (Honda GX series, Briggs & Stratton-compatible) and many residential-to-light-commercial frames, offering adjustable pressure through an integrated unloader valve.

How will this pump improve my power washer's performance?

Upgrading to this triplex pump gives a steadier flow and higher peak pressure compared with worn axial pumps. The three-plunger design reduces pulsation, so cleaning is faster and more consistent across surfaces.

• Maximum rated pressure: 4400 PSI, recommended working pressure 3400 PSI for longevity
• Flow rate: 4 GPM for quicker coverage on decks and driveways
• Triplex architecture for smoother output and better sealing under load

Can I install it on my existing gas pressure washer engine?

Yes — the pump is made to SAE industry flange dimensions and features a 1" shaft opening to match many horizontal-shaft engines. Mounting hole spacing follows standard layouts so most 9–15 HP or 270–420 cc engines will accept the unit with minimal modification.

• SAE-compliant flange with 6-1/2" diagonal hole spacing
• Shaft: 1" bore; fits commonly used couplers and adapters
• Inlet/outlet fittings: 3/4" garden-hose inlet and 3/8" quick-connect outlet for fast hookup

What maintenance and care does the TOOLCY pump need?

Routine checks keep the pump reliable: use the sight glass to verify oil level and clarity, and change the oil at regular intervals. This pump is designed for cold water only; avoid detergents or hot-water applications to protect seals and internal components.

• Inspect sight glass before each use; look for cloudy oil indicating contamination
• Recommended oil change every 60 running hours for optimal life
• Do not use for hot-water cleaning—cold water use only

How does the adjustable unloader benefit my cleaning jobs?

The built-in unloader lets you fine-tune operating pressure to match engine output and nozzle selection, improving fuel efficiency and cleaning effectiveness. It also allows the engine to return to idle safely without shutting down under high backpressure.

• Pressure adjustment for different surfaces and nozzles
• Reduces pump load when switching to idle, lowering noise and wear
• Simplifies matching pump output to engine horsepower for best performance

Who this is for: Skilled DIYers, small contractors and anyone restoring a residential or light-commercial gas pressure washer will benefit from this TOOLCY replacement pump. It’s ideal if your machine has lost pressure, pulses during use, or shows signs of leakage, and it fits many widely used engines and branded units so you can get back to efficient cleaning without buying a whole new washer.