Comet ZWD 3540 G-K Hollow Shaft Gas Flange Pressure Washer Pump with Unloader
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$697.97
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Product Information
This ZWD Series 3/4″ Hollow Shaft Pressure Washer Pump with an Unloader features a reversible crankcase for easy right- or left-hand mounting & boasts 3.5 GPM & 4000 PSI performance.
Product Details
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
Specifications:
- Includes Built-In Unloader
- 3400 RPM
- 3.5 GPM
- 4000 PSI
- 15mm Piston
- Inlet: 1/2″ FPT
- Outlet: (Discharge) 3/8″ FPT
- Gas Flange
- Approximate Weight: 21.8 lbs.
Shipping & Delivery
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Fast nationwide shipping via UPS
Most orders arrive within 5–10 business days. -
Direct-from-manufacturer items may take up to 14 business days
If a product will take longer than expected, a PowerWash.com account executive will contact you. -
Backorder notifications
If an item becomes unavailable or delayed, our team will notify you immediately with options. -
Freight delivery for large equipment
Oversized items ship by truck freight. Lift-gate service is available if needed. -
Alaska & Hawaii shipping
Delivery to AK/HI may take up to 30 business days. (Some chemical products cannot ship to AK/HI.) -
International shipping available
We ship to most countries worldwide. Call 1-800-433-2113 for rates. -
Order minimum
Orders under $15 may incur a minimum order fee. -
Track your order anytime
You can check your order status using the Orders & Returns page.
Returns & Warranty
30-Day Return Window (Unused Items)
Unused products in original packaging can be returned within 30 days of delivery.
Simple Return Process
Just contact our team to receive an RMA (Return Authorization) before sending anything back.
Restocking Fee
Returns may be subject to a 20% restocking fee.
Non-Returnable Items
Due to safety and usage factors, the following items cannot be returned:
– Pressure washers (covered under warranty only)
– Chemicals / hazmat products
– Custom or special-order equipment
Manufacturer Warranties Apply
Many products are backed by manufacturer warranties (pumps, engines, accessories, etc.).
Coverage varies by brand and product type.
Defective or Damaged Items
If something arrives damaged or defective, contact us immediately so we can make it right.
Support
Support & Questions
Talk to a real pressure washing expert
Our team helps contractors choose the right equipment, chemicals, and setup.
Need help before ordering?
We can help you confirm:
– Proper sizing (GPM, PSI, fittings)
– Product compatibility
– Best setup for your job
Support after purchase
We’re here to help with setup, usage, and troubleshooting.
Call or speak with our team
 1-800-433-2113
Fast response from experienced staff
No call centers — you’ll speak with someone who understands the equipment.
Get It Right The First Time
No guesswork. No wrong orders.
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- Financing Available
