WOJET Pressure Washers: 2 Picks Ranked by Specs

Quick picks

Our 2 picks

1 Best overall

WOJET 4400 PSI Triplex Replacement Pump

Best for: High-flow cleaning on 9-15 HP engines

Maximum Pressure

4400 PSI

Flow Rate

4.0 GPM

Pump Type

Triplex Plunger

Color

Blue

Dimensions

11.4 × 9 × 7.5 inches

Weight

17.5 pounds

View on Amazon: WOJET 4400 PSI Triplex Replacement Pump Affiliate link

This WOJET triplex plunger pump delivers 4400 PSI and 4.0 GPM for high-flow cleaning. It mounts directly to 1-inch crankshafts on 9-15 HP engines. The integrated unloader valve relieves pressure to prevent overheating. A self-priming design lets you draw water from buckets or tanks. You get a durable brass and aluminum build. It fits many major gas engine brands. This unit restores power to older machines.

Pros

• 4400 PSI maximum pressure output
• 4.0 GPM high flow rate
• Self-priming function for remote water sources
• Integrated unloader valve for cooling
• Brass pump head with ceramic pistons

Cons

• Requires 1-inch shaft engine crankshaft
• No direct faucet connection capability
• Limited to horizontal-shaft engines only

Good fit if

• You need to replace a worn pump on a 9-15 HP engine
• You work in areas without a water faucet
• You want high flow for large surface cleaning

Skip if

• Your engine has a shaft smaller than 1 inch
• You need a pump that connects to a garden hose inlet only
• You are looking for a vertical-shaft compatible pump

Verdict: WOJET 4400 PSI 4.0 GPM Pump is a high-output replacement for 9-15 HP horizontal engines. It suits users who need to clean large areas or work off-grid without a water tap.

2 Best budget

WOJET 3600 PSI 3/4-Inch Shaft Triplex Pump

Best for: heavy-duty cleaning with 3600 PSI

Maximum Pressure

3600 PSI

Flow Rate

2.7 GPM

Pump Type

Triplex Plunger

Color

Blue

Dimensions

11 × 8.7 × 7.1 inches

Weight

6 pounds

View on Amazon: WOJET 3600 PSI 3/4-Inch Shaft Triplex Pump Affiliate link

This WOJET triplex plunger pump delivers 3600 PSI and 2.7 GPM for heavy-duty cleaning. It mounts directly to 5-7 HP engines with a 3/4-inch shaft. The integrated unloader valve relieves pressure to prevent overheating. A self-priming function allows water intake from buckets or tanks. You get a durable build with brass components and ceramic pistons. This unit restores peak power to your pressure washer setup.

Pros

• Delivers 3600 PSI maximum pressure
• Provides 2.7 GPM flow rate
• Includes self-priming capability
• Features integrated unloader valve

Cons

• Lower flow rate than the 4.0 GPM competitor
• Requires direct crankshaft mounting only
• Heavier than standard consumer pumps

Good fit if

• You need 3600 PSI for tough grime
• You work near water sources without faucets
• You have a 5-7 HP engine with a 3/4-inch shaft

Skip if

• You require higher than 3600 PSI
• You need a flow rate above 2.7 GPM
• Your engine uses a different shaft size

Verdict: WOJET 3600 PSI Triplex Pump suits users needing reliable pressure for driveways or large surfaces. It fits best with 5-7 HP engines where direct mounting is possible.

Specifications side by side

WOJET Pressure Washer Pumps Ranked

WOJET focuses on compact, blue triplex pumps built for direct mounting on horizontal engines. You can choose between two distinct power tiers based on your engine size and cleaning demands. The top choice is the WOJET 4400 PSI Triplex Replacement Pump. It delivers 4.0 GPM of flow, making it ideal for high-output tasks on 9-15 HP engines. This model helps you clean large areas efficiently, even off-grid.

For smaller setups, the WOJET 3600 PSI 3/4-Inch Shaft Triplex Pump offers reliable pressure for driveways. It pairs best with 5-7 HP engines. We also evaluated the WOJET 3600 PSI Triplex Pump for general heavy-duty use. Both 3600 PSI options provide consistent performance for surface cleaning. Select the model that matches your engine’s horsepower and your required flow rate.

Who WOJET Pumps Suit

WOJET’s current lineup targets specific engine compatibility rather than offering a broad spectrum of consumer units. You will find only two triplex replacement pumps, ranging from 3600 PSI to 4400 PSI. Both models are blue and designed for direct mounting on horizontal engines. The 3600 PSI option suits 5-7 HP setups, while the 4400 PSI model fits 9-15 HP engines. There are no complete pressure washer systems listed, only replacement pumps. You also will not find electric or gas-powered standalone units in this range. This brand appears focused on high-output replacement parts for existing or custom-built machines.

Choosing the Right WOJET Pump

1. Match Engine Horsepower

   Your engine size determines which pump fits best. The top-ranked model, rated at 4400 PSI, is designed for 9-15 HP horizontal engines. It provides high flow for large areas. If you have a smaller engine, consider the second option. That 3600 PSI unit suits 5-7 HP engines. Direct mounting is easier with the correct match. Check your engine’s horsepower rating before buying. Using a pump that is too powerful can damage your engine. Ensure the shaft size aligns with your motor. This compatibility ensures reliable operation and longevity for your pressure washing setup.

2. Compare Flow Rates

   Flow rate affects cleaning speed more than pressure. The top pick offers 4.0 GPM for rapid coverage. This is ideal for washing driveways or decks quickly. The second model does not list a GPM value. You must check the listing for its specific flow. Higher flow means faster rinsing and less scrubbing. If you clean large surfaces often, prioritize GPM. If you need deep stain removal, PSI matters more. Balance both specs for the best results. Verify the flow rate in the product details. This ensures the pump meets your specific cleaning demands effectively.

3. Check Physical Dimensions

   Space constraints matter for direct mounting setups. The top pump measures 11.4 inches in length. It weighs 17.5 pounds and stands 7.5 inches high. The second model is shorter at 11 inches. It also weighs significantly less at just 6 pounds. Smaller dimensions fit tighter engine bays. Lighter weight reduces strain on mounting brackets. Measure your engine’s available space before ordering. Ensure the width and height do not interfere with other components. Proper fitment prevents vibration issues and ensures secure installation during operation.

4. Identify Shaft Requirements

   Shaft compatibility is critical for direct drive pumps. The second model explicitly specifies a 3/4-inch shaft. This detail helps you match it to your motor. The top model’s shaft size is not listed here. You must verify this in the product description. Mismatched shafts prevent installation or cause damage. Check your engine’s shaft diameter and length. Triplex pumps require precise alignment for proper function. Incorrect shaft usage leads to premature bearing failure. Confirm this spec to ensure the pump fits your engine correctly.

5. Assess Cleaning Needs

   Your intended use dictates the required PSI. The top pick delivers 4400 PSI for heavy duty tasks. It is best for high-flow cleaning on large areas. The second model offers 3600 PSI for general use. This is sufficient for driveways and patios. Choose higher pressure for thick grime or paint removal. Lower pressure works for delicate surfaces or routine maintenance. Consider the area size and dirt level. Match the pump’s output to your typical projects. This ensures efficient cleaning without unnecessary power or cost.

Frequently asked questions

See also

• wojet 4400 psi triplex replacement vs 3600 psi 3 4 inch shaft
• wojet high flow triplex plunger pressure washer review
• best brushless pressure washers
• pressure explained