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Comet ZWD 4035 G Hollow Shaft Gas Flange Pressure Washer Pump

SKU: 6305.1800.00


This ZWD Series 1″ Hollow Shaft Pressure Washer Pump features a reversible crankcase for easy right- or left-hand mounting and boasts 4.0 GPM & 3500 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

  • 4.0 GPM

  • 3500 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

Max Volume

Max Discharge Pressure

Max Pump Speed

Inlet Port

Discharge Port




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