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Product / / 85.149.059B

Comet TW5050S Triplex Pump – 5.2 GPM, 5,000 PSI

Comet TW5050S Triplex Pump – 5.2 GPM, 5,000 PSI

Specifications

UNLOADER

External 85.300.038

WARRANTY

5 Years

RPM

1,450

PUMP MODEL

Comet TW5050S

PUMP TYPE

Triplex

Oil Type

30W Non Detergent

Oil Capacity

37 oz

Thermal Relief Value

85.300.024

Max Inlet Temperature

60°C / 140°F

Manifold Type

Brass

Soap Injector

Adjustable 85.400.000 (Optional)

Discharge Size

3/8" Stainless Steel QC 85.300.108S

Inlet Size

3/4" GHF

Plunger Piston

Ceramic

Unloader Type

External 85.300.038

Max GPM

5.2

Shaft Size

24 mm

Weight

46 lbs

Belt Drive

Gas / Electric

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PRODUCT

DESCRIPTION

Industrial Belt Drive Pump for Extreme Pressure Applications

The Comet TW5050S Triplex Pump Assembly (Bare Pump Part #85.140.059) is engineered for the most demanding professional applications, where extreme pressure and reliable performance are essential. Delivering 5,000 PSI at 5.2 GPM, this belt-drive pump is built for contractors, industrial operators, and facilities that require unmatched cleaning power and long-lasting durability.

Manufactured by Comet, one of the most respected names in pump technology, the TW5050S features a brass manifold, ceramic plungers, stainless steel discharge fittings, and an external unloader system for precise control. Running at a low 1,450 RPM, this pump is designed for cooler operation, less vibration, and extended service life. Backed by a 5-year warranty, the TW5050S is built to withstand the heaviest workloads.

Key Features

  • Bare Pump Part #: 85.140.059

  • Pump Manufacturer: Comet

  • Pump Model: TW5050S

  • Pump Style: Triplex, belt drive

  • Drive Type: Gas/Electric compatible

  • Max Pressure: 5,000 PSI

  • Max Flow Rate: 5.2 GPM

  • Shaft Size: 24 mm

  • Unloader Type: External (85.300.038)

  • Plunger Material: Ceramic

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

  • Discharge Size: 3/8" Stainless Steel QC (85.300.108S)

  • Soap Injector: Adjustable (85.400.000 – optional)

  • Manifold Type: Brass

  • RPM: 1,450

  • Max Inlet Temp: 60°C / 140°F

  • Thermal Relief Valve: 85.300.024

  • Oil Capacity: 37 oz

  • Oil Type: 30W non-detergent oil

  • Weight: 46 lbs

  • Warranty: 5 Years

Professional Triplex Design

The triplex plunger configuration ensures smoother operation and maximum efficiency. With three ceramic plungers, the TW5050S offers superior resistance to heat and wear, extending seal life and reducing long-term maintenance costs.

This pump’s 5.2 GPM water flow provides strong volume for efficient coverage, while its 5,000 PSI maximum pressure is designed to handle the toughest jobs—removing hardened grease, stripping paint, cleaning construction machinery, and preparing surfaces for industrial refinishing.

Rugged Construction for Demanding Work

The TW5050S is built to perform in the harshest working conditions:

  • Brass manifold offers excellent durability, corrosion resistance, and heat dissipation.

  • Ceramic plungers provide exceptional wear resistance, protecting seals and extending the pump’s life.

  • Stainless steel quick-connect discharge (3/8" – 85.300.108S) ensures secure, leak-free high-pressure connections.

  • 24 mm solid shaft integrates with gas or electric belt-drive systems for secure, stable performance.

  • At 46 lbs, the TW5050S is a robust, heavy-duty pump designed for continuous professional use.

Operator-Friendly Features

Comet has integrated features that make the TW5050S reliable and simple to use:

  • External unloader (85.300.038): Provides precise pressure control and simplifies servicing.

  • Adjustable soap injector (optional, 85.400.000): Allows detergent application when needed for versatile cleaning.

  • Thermal relief valve (85.300.024): Protects the pump from overheating during bypass operation.

  • Stainless steel discharge fittings: Deliver durability and corrosion resistance under high pressure.

These operator-focused details make the pump safer and more convenient, reducing downtime in the field.

Low RPM Advantage

The belt-drive design allows the pump to run at just 1,450 RPM, significantly reducing wear compared to direct-drive pumps. Lower operating speeds mean:

  • Less vibration

  • Lower operating temperature

  • Quieter performance

  • Longer service life for bearings, seals, and plungers

The pump also handles water inlet temperatures up to 140°F (60°C), making it capable of hot water applications for enhanced cleaning results.

Easy Maintenance

Maintenance on the TW5050S is straightforward:

  • Requires 37 oz of 30W non-detergent oil for proper lubrication.

  • Oil checks and changes are quick and easy, ensuring the pump remains in top condition.

  • Serviceable components and heavy-duty construction provide years of dependable use with routine care.

By following proper maintenance guidelines, operators can expect consistent performance and extended pump life.

Common Applications

The Comet TW5050S Triplex Pump is engineered for professionals who need maximum PSI and reliable flow:

  • Industrial Cleaning – Removing grease, grime, and buildup from machinery and equipment.

  • Fleet Washing – Cleaning large commercial trucks, trailers, and buses.

  • Agriculture – Washing tractors, harvesters, and heavy-duty farm equipment.

  • Construction – Cleaning concrete equipment, job sites, and tools.

  • Surface Preparation – Stripping paint, coatings, and tough debris before refinishing.

  • Property Maintenance – Power washing large surfaces such as parking lots, sidewalks, and building exteriors.

With its unmatched 5,000 PSI rating, this pump is ideal for operators tackling the most demanding cleaning and prep tasks.

Product Specifications

  • Part #: 85.140.059

  • Manufacturer: Comet

  • Model: TW5050S

  • Pump Style: Triplex, belt drive

  • Drive Type: Gas/Electric compatible

  • Max PSI: 5,000

  • Max Flow: 5.2 GPM

  • Shaft Size: 24 mm

  • RPM: 1,450

  • Unloader: External (85.300.038)

  • Soap Injector: Adjustable, optional (85.400.000)

  • Manifold: Brass

  • Plungers: Ceramic

  • Inlet: 3/4" GHF

  • Discharge: 3/8" Stainless Steel QC (85.300.108S)

  • Oil Capacity: 37 oz (30W non-detergent oil)

  • Thermal Relief Valve: 85.300.024

  • Max Inlet Temp: 60°C / 140°F

  • Weight: 46 lbs

  • Warranty: 5 Years

Comet Reliability

The Comet TW5050S is part of Comet’s premium line of industrial triplex pumps, known worldwide for their reliability and performance in the toughest environments. With its brass manifold, ceramic plungers, external unloader, and belt-drive efficiency, this pump is built for operators who demand both maximum cleaning power and long-term durability.

Backed by a 5-year warranty, the TW5050S delivers the industrial-grade performance professionals need. For extreme pressure applications, it is the trusted choice.

Frequently Asked Questions about Pressure Washers

How to store a pressure washer?

To ensure the durability of your heavy duty pressure washer:

  • Empty the gas tank to prevent fuel from degrading or clogging the engine.
  • Empty the pump and hoses of any remaining water.
  • Perform necessary maintenance before storage.
  • Store in a dry area.
  • Cover.

What is a pressure washer?

A power washer is a cleaning machine that uses a gasoline engine to power a high pressure water pump and nozzle. It’s used to clean driveways, decks, vehicles, outdoor furniture and more by spraying water at high PSI to remove dirt, grime, mold and other debris.Many models also come with a detergent tank for added cleaning power.

How does a power washer work?

A power washer works by drawing water from a connected hose and pumping it through a high pressure nozzle. The gas engine powers the pump which pressurizes the water and then expels it through the nozzle at high speed to clean the surface. The water pressure is measured in PSI (pounds per square inch) and the flow rate is measured in GPM (gallons per minute).Many models also feature adjustable water pressure settings to cater to different cleaning needs. BE makes pressure washing easy with models available for light jobs and heavy duty commercial cleaning projects.

Gas vs Electric power washers?

The main difference is that a gas pressure washer, known for its cleaning power, is powered by a gasoline engine, making it more powerful and portable, while an electric pressure washer is powered by electricity and is generally quieter and lighter.

Gas pressure washers are for heavy duty and large areas due to their durability, whereas electric pressure washers are for smaller jobs.

Your BE electric pressure washer is perfect for smaller jobs and built for portability, and we offer a wide range of electric models. Included with our electric models is a long extension cord for use anywhere around your house.

What to consider?

When choosing a gas pressure washer consider:

  • Pressure (PSI): More PSI means more cleaning power but also more potential for damaging delicate surfaces.
  • Flow Rate (GPM): More GPM means faster cleaning as more water is dispensed.
  • Engine Power: Bigger engines mean more durability and power.
  • Portability: Weight, handle design and wheel size for easier to move.
  • Nozzles: Multiple spray nozzles to adjust the spray pattern for different tasks.
  • Adjustable Nozzle: Allows for fine-tuning the spray intensity and pattern for various cleaning needs.

How much pressure do I need for?

The required pressure (PSI) and cleaning power depend on the surface you’re cleaning:

  • Light duty (car washing, outdoor furniture): 1,300-1,800 PSI.
  • Medium duty (patios, fences, decks): 2,000-3,000 PSI.
  • Heavy duty (driveways, brick walls, large equipment): 3,000+ PSI.

Many pressure washers come with adjustable pressure settings to handle different cleaning tasks effectively.

Can a pressure washing damage surfaces?

Yes, a power washer can damage surfaces if used incorrectly. High pressure water can strip paint, dent soft surfaces or even cause structural damage if the pressure is too high or the nozzle is held too close to the surface. Always use the right PSI for the material you’re cleaning and keep a safe distance from delicate surfaces.

To prevent damage, consider using a model with adjustable pressure settings.

How to maintain your pressure washer?

To ensure the durability and smooth operation of a pressure washer:

  • Change the oil as per manufacturer’s instructions.
  • Clean or replace the air filter to ensure good airflow.
  • Inspect and clean the nozzle regularly to prevent clogs.
  • Drain the gas tank if you’re storing the washer for a long time.
  • Check the hoses for leaks or damage and replace them if needed.
  • Follow regular maintenance requirements to keep the washer in optimal condition.

Can I use a pressure washer in cold weather and low water temperature?

You can use a pressure washer in cold weather but it’s more difficult. The water flow rate in the hoses and pump can freeze and damage the equipment. If you plan to use your pressure washer in cold temperatures make sure to winterize it and store it in a warm area when not in use. You can also use anti-freeze solutions for pressure washers.

Some models are designed to use hot water, which can be particularly effective for cleaning in cold weather.

Do I need any accessories?

Common accessories for power washers: