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Comet EWD4042G-K – Pressure Washer Pump with Built-In Unloader


Available for Purchase!

SKU: C-6311015000 Categories: ,


Comet EWD4042G-K – Pressure Washer Pump with Built-In Unloader

Same in Performance to Simpson / AAA 90034 Pressure Washer Pump – 4200 PSI @ 4.0 GPM.

Comet EWD4042G-K pressure washer pump 4200 PSI @ 4.0 GPM triplex pump comes complete with Built-In Pressure Regulator & Easy Start Valve and Oil. Just mount the pump, attach a plumbing set, set the pressure and your ready to go! Also known as 6311.0150.00

Comes with 1/2 in. FPT Inlet & 3/8 in. MPT Outlet.

Manufacturer Specs:
1 in. Hollow Shaft with SAE J609B Flange.
15mm Piston
RPM: 3400
Max. GPM: 4.0
Max. PSI: 4200

Pump Features:

  • -K Model includes built in unloader
  • Efficient Stainless Steel Check Valves with removable plugs for easy inspection.
  • Valves with double O-Ring to reduce overpressure risks.
  • Solid ceramic plungers to be high corrosion and abrasion proof.
  • 1/2 in. FPT Inlet – 3/8 in. Outlet (see pump sections for M or F)
  • Direct Drive Mounting Flange
  • Stainless Steel hardened piston guides.
  • Wide Oil Viewer
  • Thermal Relief Valve
  • Unloader valve knob with anti-unscrewing device.
  • Oversized conical roller bearings ensure long durability.
  • High-strength brass pump manifold with integrated unloader valve & pre-arranged for:
    • Detergent Suction (Chemical Injector)
    • Pressure Gauge
    • Thermostat Valve
    • Pressure Booster

Repair Kits:
5025.0075 Complete Valve Kit
5019.0708 Water Seal Kit
2409.0260 Piston Kit
5019.0285 Oil Seal Kit
1215.0586 Valve Kit + Seat (replaces Simpson / AAA 7105410)


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Prop 65 Warning!

This product can expose you to chemicals which are known to the State of California to cause cancer.