Wojet Pressure Washer Pump Guide: Specifications and Engine Compatibility

Best for: Commercial flat surface and concrete cleaning

Pros

• 20-inch stainless steel housing
• Four-wheel caster mobility
• Sealed pre-greased swivel

Cons

• Requires separate high-pressure washer

The WOJET 20” Commercial Pressure Washer Surface is a heavy-duty rotary cleaning attachment designed for pressure washers operating between 2000 and 4500 PSI with flow rates between 2 and 4 GPM. Operating with two high-pressure water jets beneath a 20-inch stainless steel housing, it delivers uniform cleaning without the striping typical of standard spray wands. The 27-pound unit features four caster wheels and dual handles for smooth maneuvering across driveways, sidewalks, and patios.

A fully sealed, pre-greased central swivel prevents debris clogging, while an integrated 63-inch hose terminates in a standard 3/8-inch quick plug for direct connection. Wojet includes two replacement 25020 nozzles, a nozzle cleaner, Teflon tape, and assembly hardware. This attachment suits commercial operators running equipment like a power washer honda engine who need to wash flat surfaces rapidly. Because it is a surface tool rather than an engine-driven pump, it cannot restore hydraulic pressure to a pressure washer with a broken pump.

• Dual-jet rotary spray bar with replaceable 25020 nozzles for streak-free cleaning
• Fully sealed and pre-greased swivel mechanism engineered to prevent debris fouling
• Four-wheel caster base with dual ergonomic handles and integrated 63-inch hose
• Universal 3/8-inch quick-connect plug compatible with washers from 2000 to 4500 PSI

The WOJET Pressure Washer Pump&DN10 Ball Valve is an industrial-grade triplex assembly engineered for 9 to 15 horsepower (250 to 420 cc) horizontal-shaft engines. Built with a 1-inch shaft bore, this wojet 1 inch shaft pump delivers 4400 PSI at 4.0 GPM, making it a direct replacement for Honda GX270, GX340, and GX390 engines, as well as commercial Simpson and DEWALT models. The triplex plunger configuration provides consistent volumetric efficiency with minimal vibration during extended commercial washing cycles.

An integrated unloader valve instantly relieves internal pressure when the trigger is released, circulating water through the manifold to prevent heat buildup. The included DN10 high-pressure ball valve allows operators to switch between spray wands and surface cleaners without shutting off the gas engine or manually bleeding hose pressure. This model suits commercial contractors managing high-horsepower equipment who need fast tool transitions. Operators with smaller 5 to 7 HP engines will find this 4400 PSI pump overpowers their powerplants, requiring a 3/4-inch shaft alternative.

• Commercial triplex plunger design producing 4400 PSI at 4.0 GPM
• Engineered for 9 to 15 HP (250 to 420 cc) gas engines with 1-inch shafts
• Integrated unloader valve system providing instant thermal bypass protection
• Includes DN10 high-pressure ball valve for hot-swapping attachments under pressure

Best for: Mid-sized gas washers needing triplex reliability

Pros

• 3600 PSI commercial rating
• Fits standard 3/4-inch shafts
• Included M22 adapter kit

Cons

• Cannot fit 1-inch shafts

Best for: Commercial contractors wanting stainless quick connects

Pros

• 4400 PSI triplex plunger design
• Stainless steel connector kit
• Fits 9 to 15 HP engines

Cons

• Incompatible with smaller engines

The WOJET Triplex Plunger Pressure Washer Pump provides commercial hydraulic output for 9 to 15 horsepower (90 to 440 cc) horizontal gas engines equipped with 1-inch shafts. Operating at 4400 PSI and 4.0 GPM, this wojet triplex plunger pressure washer pump generates the pressure needed for industrial fleet washing and heavy concrete restoration. The standard bolt pattern mounts directly onto compatible commercial engines from Honda, Simpson, DEWALT, AAA, and Westinghouse.

A built-in bypass unloader valve protects internal components by routing water through the manifold when the spray gun is closed. This package includes a quick-connect kit machined from 100 percent stainless steel, transforming threaded ports into leak-proof quick-release couplers. The fittings support gas washers and electric units with M22 14 mm outlets, though electric units with 15 mm stems require separate adapters. This wojet 4400 psi pressure washer pump fits commercial technicians who want durable stainless fittings, but it cannot mount to domestic engines with 3/4-inch shafts.

• Heavy-duty 4400 PSI rating at 4.0 GPM flow rate for 1-inch horizontal shafts
• Direct replacement for 9 to 15 HP engines including Honda GX and Simpson models
• Built-in bypass unloader valve that automatically recirculates water to limit heat
• Supplied with a 100 percent stainless steel M22 14 mm quick-connect adapter kit

The WOJET Triplex Plunger Pressure Washer Pump brings commercial triplex engineering to mid-sized utility engines. Designed for 5 to 7 horsepower (160 to 220 cc) horizontal engines with a 3/4-inch shaft, this wojet 3/4 shaft pressure washer pump delivers 3600 PSI at 2.7 GPM. This hydraulic profile delivers more cleaning force than entry-level axial pumps while operating comfortably within the torque limits of small utility powerplants.

The integrated unloader valve relieves pressure when the trigger is disengaged, allowing water to cycle through the manifold and protect internal packings from overheating. Wojet includes an M22 14 mm quick-connect fitting set to eliminate tedious hose threading. For owners replacing a worn factory unit on machines like a dewalt 3600 psi pump, this 3/4-inch unit provides matching mounting geometry. It suits homeowners and property managers seeking triplex durability, though it cannot fit larger commercial engines featuring 1-inch crankshafts.

• Triplex plunger mechanism delivering 3600 PSI at 2.7 GPM output
• Engineered for 5 to 7 HP (160 to 220 cc) horizontal engines with 3/4-inch shafts
• Factory-integrated unloader valve preventing manifold overheating during bypass
• Includes M22 14 mm quick-connect adapter hardware for rapid hose coupling

The WOJET Pressure Washer Pump ＆ WOJET is a replacement pump designed for 3/4-inch horizontal shafts on 6.5 to 7 horsepower (180 to 225 cc) gas engines. Delivering 3400 PSI at 2.5 GPM, this wojet 3400 psi pump focuses on accessible pressure regulation and rugged materials. The housing uses rust-resistant die-cast aluminum, while the hydraulic manifold features forged brass paired with polished ceramic plungers for extended seal life.

A key operational benefit is the upgraded unloader knob, which allows hand adjustment of output pressure without tools. Operators can twist the knob to lower pressure for soft washing or raise it to full 3400 PSI capacity for stubborn driveway stains. A thermal relief valve discharges hot water during bypass, protecting internal seals from heat degradation. This model suits residential users wanting simple pressure control on standard 3/4-inch engines. While the listing text mentions 4400 PSI capabilities, this specific unit operates at 3400 PSI and cannot support 1-inch commercial engines.

• Tool-free hand-adjustable unloader knob for rapid manual pressure regulation
• Forged brass manifold and ceramic pistons in a die-cast aluminum crankcase
• Factory-installed thermal relief valve prevents seal damage during bypass
• Direct fit for 3/4-inch horizontal shafts on 180 to 225 cc (6.5 to 7 HP) engines

The WOJET Pressure Washer Pump provides broad engine interchangeability across the 3/4-inch horizontal shaft category. Delivering 3400 PSI at 2.5 GPM, with companion listing details referencing 3600 PSI at 2.7 GPM in triplex configurations, this replacement kit fits 5 to 7 horsepower (160 to 225 cc) engines. It serves as a direct drop-in replacement for Honda GX160, GX200, Briggs & Stratton series engines, Generac OHV engines, Subaru EA models, and Kohler powerplants.

Designed for straightforward field replacement, the pump features self-priming hydraulic channels and includes anti-seize lubricant to prevent keyway binding on the drive shaft. The hand-adjustable unloader knob lets operators alter pressure without tools. Similar to pump architectures analyzed in our comet pressure washer pump guide, having accessible pressure modulation protects small engines during intermittent cycles. This pump is ideal for homeowners needing a dependable replacement for standard utility engines, but it cannot be installed on 1-inch commercial engine shafts.

• Universal 3/4-inch horizontal shaft mounting pattern fitting Honda, Briggs, and Generac
• Self-priming internal manifold rated at 3400 PSI and 2.5 GPM
• Upgraded tool-free unloader knob for manual pressure adjustment
• Supplied with anti-seize compound to facilitate installation and prevent shaft seizing