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Comet ZWD 3540 G Hollow Shaft Gas Flange Pressure Washer Pump

Comet ZWD 3540 G Hollow Shaft Gas Flange Pressure Washer Pump

SKU: 6305.1000.00


This ZWD Series 1″ Hollow Shaft Pressure Washer Pump features a reversible crankcase for easy right- or left-hand mounting and boasts 3.4 GPM & 4000 PSI performance.

Designed as a popular replacement or OEM pump for many medium duty Pressure Washers, the ZWD Series of Pumps feature a reversible crankshaft for easy right- or left-hand mounting. They also feature Stainless Steel Unitized Check Valves, Heat-Resistant Solid Ceramic Plungers, and more. ZWD Series Pumps boast a 5-Year Warranty from Comet.

All Comet ZWD Series pumps include:


  • Increased Fin Depth Increases Surface Area to Maximize Heat Dissipation
  • Stainless Steel Unitized Check Valves
  • Heat-Resistant Solid Ceramic Plungers Operating on Lubricated Packings
  • Direct Drive Mounting Flange
  • Reinforced Crankcase for Increased Load Capacity
  • Enlarged Crankcase Increases Oil Capacity for Better Lubrication and Lower Operating Temperatures
  • 1-Piece Industrial-Grade Oversized Bronze Connecting Rods
  • 5-Year Pump Warranty



  • 3400 RPM
  • 3.4 GPM
  • 4000 PSI
  • 15mm Piston
  • Inlet: 1/2″ FPT
  • Outlet: (Discharge) 3/8″ FPT
  • Gas Flange
  • Approximate Weight: 17.5 lbs.


Weight 18.5 lbs
Shaft Diameter

1.0 in / 25.4 mm

Max Volume

3.4 GPM

Max Discharge Pressure

4000 PSI

Max Pump Speed

3400 RPM

Inlet Port

1/2-14 BSPP-F

Discharge Port

3/8-19 BSPP-F






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