Comet BWD-K3027G Pump Assembly – 3.0 GPM, 2,700 PSI, 3/4" Shaft

Heavy-Duty Triplex Pump for Gas Pressure Washers

The Comet BWD-K3027G Pump Assembly (Bare Pump Part #85.140.085) is a durable triplex direct-drive gas pump designed for long-lasting, professional-grade performance. Delivering up to 2,700 PSI at 3.0 GPM, this pump is built for pressure washer applications where reliability, power, and smooth operation are essential.

Manufactured by Comet, a global leader in pump technology, the BWD-K3027G features ceramic plungers, a brass manifold, and a built-in unloader to maximize service life while simplifying installation. Packaged boxed and backed by a 5-year warranty, this pump provides excellent value for homeowners and commercial operators who demand consistent results.

Key Features

• Bare Pump Part #: 85.140.085

• Pump Manufacturer: Comet

• Pump Model: BWD-K3027G

• Pump Style: Triplex, direct-drive gas

• Max PSI: 2,700

• Max GPM: 3.0

• Shaft Size: 3/4"

• Unloader Type: Built-in

• Plunger (Piston): Ceramic for maximum durability

• Inlet Size: 3/4" GHF (garden hose fitting)

• Discharge Size: 3/8" Brass QC (85.300.103)

• Soap Injector: Fixed, integrated chemical injector

• Manifold Type: Brass for strength and corrosion resistance

• RPM: 3,450

• Max Inlet Temp: 60°C / 140°F

• Thermal Relief Valve: 85.300.023 included

• Oil Capacity: 10 oz

• Oil Type: 30W non-detergent oil

• Weight: 13.3 lbs

• Warranty: 5 Years

Triplex Power and Durability

Unlike axial pumps found in consumer-grade washers, the triplex plunger design of the BWD-K3027G delivers smoother performance, higher efficiency, and extended service life. Using three precision-engineered ceramic plungers, this pump resists wear, handles heat better, and maintains consistent output even under heavy workloads.

With 2,700 PSI of cleaning power at 3.0 GPM, the pump strikes the perfect balance between pressure and water flow. This makes it versatile enough to handle tough cleaning jobs such as concrete, siding, and equipment, while still being efficient for larger surfaces where higher flow saves time.

The brass manifold offers excellent corrosion resistance and durability, providing a rugged, long-lasting pump body that stands up to years of demanding use.

Built-In Convenience Features

The built-in unloader simplifies setup by regulating water pressure internally, reducing the need for additional external components. This protects the pump and ensures smooth operation.

A fixed chemical injector is integrated into the system, making it easy to apply soaps, detergents, or degreasers when cleaning jobs require extra power. Simply switch to a low-pressure nozzle, and the injector automatically draws solution into the water stream.

The brass quick-connect discharge fitting (3/8”) ensures secure and reliable hose connections, reducing leaks and making setup fast and hassle-free.

Protection and Maintenance

The BWD-K3027G comes with a thermal relief valve (85.300.023) to prevent overheating during extended bypass operation. By releasing hot water and replacing it with cooler water, the valve protects seals and internal components, extending pump life.

The pump requires 10 oz of 30W non-detergent oil to keep its internal components properly lubricated. Routine oil checks and changes are simple, low-cost maintenance steps that maximize long-term reliability.

With a maximum water inlet temperature of 140°F (60°C), this pump is designed to handle warmer water supplies than many consumer-grade models, providing greater flexibility for different applications.

At 13.3 lbs, this pump’s weight reflects its rugged construction and triplex durability, built to perform reliably in residential, commercial, and light industrial environments.

Common Applications

The Comet BWD-K3027G is designed for gas-powered pressure washers used in both residential and professional environments. With its flow rate and pressure balance, it’s ideal for:

• Driveways and Sidewalks – Remove oil stains, dirt, and algae with consistent power.

• Decks, Patios, and Fences – Clean wood, composite, and stone surfaces efficiently.

• Fleet and Vehicle Washing – Keep cars, trucks, trailers, and RVs spotless.

• Construction and Farm Equipment – Power through mud, grease, and debris on machinery.

• Property Maintenance – Handle siding, brick, outdoor furniture, and more.

The 3/4” shaft size ensures compatibility with many small gas engines, making the pump a versatile replacement option for high-performance washers.

Product Specifications

• Part #: 85.140.085

• Manufacturer: Comet

• Model: BWD-K3027G

• Style: Triplex, direct-drive gas

• Max Pressure: 2,700 PSI

• Max Flow Rate: 3.0 GPM

• Shaft Size: 3/4”

• RPM: 3,450

• Unloader: Built-in

• Soap Injector: Fixed

• Manifold Material: Brass

• Plunger Material: Ceramic

• Inlet Connection: 3/4” GHF

• Discharge Connection: Brass QC 3/8" (85.300.103)

• Oil Capacity: 10 oz (30W non-detergent oil)

• Thermal Relief Valve: 85.300.023

• Max Inlet Temp: 60°C / 140°F

• Weight: 13.3 lbs

• Warranty: 5 Years

Backed by Comet Quality

With decades of innovation and trusted engineering, Comet Pumps are known worldwide for their durability and precision. The BWD-K3027G Pump Assembly continues this tradition, combining triplex durability, ceramic plungers, and a brass manifold into a pump that’s built to outperform and outlast.

Backed by a 5-year warranty, the BWD-K3027G offers exceptional long-term value and reliability. For homeowners and contractors alike, it’s a smart investment to restore or upgrade your pressure washer with professional-grade power.

When you need consistent performance and rugged durability, choose the Comet BWD-K3027G Pump Assembly—engineered for results, built to last.