Comet ZWD4040G Fully Plumbed Pressure Washer Pump
The Comet ZWD4040G Fully Plumbed Pressure Washer Pump takes one of the industry's most trusted direct-drive pumps and makes installation easier than ever. Instead of sourcing individual components and plumbing everything yourself, this unit arrives professionally assembled and ready to install.
Built around the Comet ZWD4040G, this pump delivers 4 GPM at 4000 PSI and is designed for professional pressure washing applications that demand reliable daily performance. Featuring a VRT3 EZ Start unloader, 8 GPM rated inlet filter, and thermal relief valve already installed, this setup reduces installation time and eliminates the guesswork of sourcing compatible components separately.
The ZWD4040G features a reversible crankshaft for left or right-hand mounting flexibility, a reinforced crankcase for increased load capacity, and larger oil capacity to help maintain cooler operating temperatures during extended use.
Whether you're replacing a worn-out pump or building a new pressure washer system, this professionally assembled package gets you back to work faster.
What's Included
Comet ZWD4040G Pump: Professional-grade 4 GPM, 4000 PSI direct-drive pressure washer pump
VRT3 EZ Start Unloader: Pre-installed for smooth startup and consistent pressure regulation
8 GPM Rated Inlet Filter w/ Garden Hose Nut: Professionally assembled and ready for quick hookups
Thermal Relief Valve: Protects the pump from excessive temperatures during bypass operation
Fully Plumbed Assembly: Ready to mount and connect
Why Buy a Fully Plumbed Pump?
Building a pressure washer pump assembly from individual components can be time-consuming and lead to compatibility issues. This fully assembled configuration eliminates the hassle by providing a professionally built package that's ready for installation.
No guesswork. No sourcing multiple fittings. No assembly required.
Simply mount, connect, and get to work.
Frequently Asked Questions
What does fully plumbed mean?
Fully plumbed means the pump arrives professionally assembled with the unloader, regulator, and thermal relief valve already installed and ready for installation.
What engines is the Comet ZWD4040G compatible with?
The ZWD4040G is commonly paired with engines that support a 1" hollow SAE J609B shaft and operate at direct-drive speeds.
Is this a direct-drive pump?
Yes. The Comet ZWD4040G is a direct-drive pressure washer pump.
Can the pump be mounted in different orientations?
Yes. The reversible crankshaft design allows for both left and right-hand mounting configurations.
What is the VRT3 EZ Start unloader?
The VRT3 EZ Start unloader helps reduce startup back pressure, making engine starts easier while regulating operating pressure during use.
What is a thermal relief valve?
A thermal relief valve protects the pump by releasing hot water if temperatures become excessive while the system is in bypass mode.
Comet ZWD4040G Fully Plumbed Pump | Features
Professionally Assembled & Ready to Install
Comes fully plumbed with the critical components already installed, reducing installation time and simplifying replacements.
4 GPM at 4000 PSI Performance
Delivers the pressure and flow needed for professional residential and commercial pressure washing applications.
VRT3 EZ Start Unloader
Reduces startup back pressure to allow smoother, easier no-load startups.
Reversible Crankshaft Design
Supports both left and right-hand mounting configurations for installation flexibility.
Reinforced Crankcase
Larger crankcase design improves load capacity and helps dissipate heat for longer service life.
Increased Oil Capacity
Additional oil volume helps reduce operating temperatures and improve pump longevity.
Industrial Ceramic Plungers
15mm solid ceramic plungers provide excellent resistance to wear, heat, and abrasion.
Thermal Relief Protection
Protects the pump from excessive heat buildup during bypass operation.
Forged Bronze Connecting Rods
Heavy-duty internal components engineered for long-term durability.
Comet ZWD4040G Fully Plumbed Pump | Specifications
| Specification | Details |
| Model | Comet ZWD4040G (6305.0914.00) |
| Max Pressure | 4000 PSI |
| Flow Rate | 4.0 GPM |
| Max Speed | 3400 RPM |
| Drive Type | Direct Drive |
| Shaft | 1" Hollow SAE J609B |
| Inlet Size | 1/2" FPT |
| Outlet Size | 3/8" FPT |
| Plungers | 15mm Solid Ceramic |
| Crankcase Capacity | 14 oz. |
| Pump Material | Reinforced Aluminum, Forged Bronze. |
| Unloader | VRT3 EZ Start |
| Component | Warranty |
| Triplex Plunger Pump | 5 years (See More) |
