Centurion P3+ Belt Drive Triplex 3100 PSI 3.1 GPM Pressure Washer Bare Pump – 85.120.105B

Professional-Grade Power. Compact Strength. Built for Everyday Performance.

Unleash Reliable Direct-Drive Power with Proven Triplex Engineering

The Centurion CTG1S Direct-Drive Triplex Pump (85.120.105B) is engineered for dependable performance in demanding residential and light-commercial pressure washer applications. Manufactured by CP, a global leader in high-pressure pump technology, this pump delivers 3,100 PSI at 3.1 GPM, making it an ideal solution for contractors, equipment builders, and service professionals who demand consistent power in a compact format.

Designed for gas-powered direct-drive systems, the CTG1S operates at 3,450 RPM with a 3/4″ hollow shaft, offering a lightweight, space-saving solution without sacrificing durability. Featuring a solid brass manifold, ceramic plungers, external unloader, and adjustable soap injector, this pump is built for long service life, smooth operation, and easy maintenance across daily cleaning tasks.

Technical Overview

• BARE PUMP PART #: 85.120.105B
• PUMP MANUFACTURER: CP
• PUMP MODEL: CTG1S
• DRIVE TYPE: Direct Drive (Gas)
• SHAFT SIZE: 3/4″
• PUMP STYLE: Triplex
• MAX PSI: 3,100
• MAX GPM: 3.1
• UNLOADER TYPE: External
• PLUNGER (PISTON): Ceramic
• INLET SIZE: 3/4″ GHF
• DISCHARGE SIZE: 3/8″ Brass Quick Connect
• SOAP INJECTOR: Adjustable
• MANIFOLD TYPE: Brass
  RPM: 3,450
• MAX INLET TEMP: 60 °C / 140 °F
• THERMAL RELIEF VALVE: 85.300.024
• OIL CAPACITY: 9.75 fl oz
• OIL TYPE: 30W Non-Detergent
• WEIGHT: 10 lbs
• WARRANTY: 7 Years

Built for High-Efficiency Direct-Drive Cleaning

The CTG1S delivers the ideal balance of pressure and flow for fast, effective cleaning of vehicles, driveways, siding, decks, and equipment. Its 3,100 PSI output provides strong cutting power, while the 3.1 GPM flow rate ensures proper rinsing and surface coverage. This makes it a perfect match for:

• Mobile pressure washer units
  
• Residential and contractor-grade machines
  
• Light commercial wash systems
  
• Equipment replacement and OEM builds
  

With its compact 10 lb design, the CTG1S is easy to install, transport, and service — maximizing uptime and minimizing operating costs.

Key Features

Triplex Ceramic Plunger Design

The triplex plunger system uses three ceramic pistons to generate smooth, consistent flow with reduced pulsation. Ceramic plungers offer exceptional wear resistance, heat tolerance, and extended seal life for higher durability under continuous use.

Brass Manifold Construction

The solid brass manifold provides superior corrosion resistance and pressure stability compared to aluminum housings. It ensures reliable sealing, long-term strength, and compatibility with detergents and cleaning chemicals.

External Unloader for Precision Control

The external unloader allows accurate pressure adjustment and quick servicing. It also improves thermal control during bypass operation, protecting seals and valves from heat damage.

Adjustable Soap Injector

The adjustable soap injector allows precise chemical draw for efficient detergent application, improving cleaning results while reducing chemical waste.

Thermal Relief Valve Protection

The thermal relief valve (85.300.024) automatically releases overheated water during idle operation, preventing internal heat damage and significantly extending pump life.

Direct-Drive Advantage

The direct-drive configuration offers a compact, efficient, and cost-effective solution for high-speed pressure washer systems.

Benefits of Direct-Drive Pumps:

• Compact footprint for portable machines
  
• Lower overall system cost
  
• Fewer moving components
  
• High-speed performance for light-to-medium duty work
  
• Easy engine coupling with minimal alignment setup
  

Easy Installation & Maintenance

With its 3/4″ shaft, 3/4″ GHF inlet, and 3/8″ brass quick-connect outlet, the CTG1S installs quickly into most standard gas-powered pressure washer frames.

Startup Requirements:

• Fill with 9.75 fl oz of 30W non-detergent oil
  
• Prime pump before full-pressure operation
  
• Verify unloader setting and water supply filtration
  

Routine maintenance is simple and cost-effective, helping maximize service life while minimizing downtime.

Built for Professionals. Backed by a 7-Year Warranty.

Despite its compact size, the Centurion CTG1S is built with professional-grade components and is backed by a 7-year manufacturer’s warranty, one of the strongest warranties in its class. Every pump is factory tested to ensure pressure stability, flow accuracy, and leak-free performance out of the box.

Product Highlights

• Model: CTG1S
• Bare Pump #: 85.120.105B
• Drive Type: Direct Drive (Gas)
• Pressure / Flow: 3,100 PSI @ 3.1 GPM
• RPM: 3,450
• Manifold: Brass
• Plungers: Ceramic
• Unloader: External Adjustable
• Soap Injector: Adjustable
• Thermal Relief Valve: 85.300.024
• Oil Capacity: 9.75 fl oz (30W Non-Detergent)
• Weight: 10 lbs
• Warranty: 7 Years

The Centurion CTG1S Direct-Drive Triplex 3,100 PSI 3.1 GPM Pressure Washer Pump (85.120.105B) delivers compact power, reliable performance, and long-term durability for residential and light-commercial cleaning systems. Featuring a brass manifold, ceramic plungers, external unloader, adjustable soap injector, and thermal protection, this pump offers professional-grade performance in a lightweight, direct-drive design. Backed by a 7-year warranty, the CTG1S is built to perform day after day.

BARE PUMP PART #: 85.120.105B
PUMP MANUFACTURER: CP
PUMP MODEL: CTG1S
DRIVE TYPE: Direct Drive (Gas)
SHAFT SIZE: 3/4″
PUMP STYLE: Triplex
MAX PSI: 3,100
MAX GPM: 3.1
UNLOADER TYPE: External
PLUNGER (PISTON): Ceramic
INLET SIZE: 3/4″ GHF
DISCHARGE SIZE: 3/8″ Brass Quick Connect
SOAP INJECTOR: Adjustable
MANIFOLD TYPE: Brass
RPM: 3,450
MAX INLET TEMP: 60 °C / 140 °F
THERMAL RELIEF VALVE: 85.300.024
OIL CAPACITY: 9.75 fl oz
OIL TYPE: 30W Non-Detergent
WEIGHT: 10 lbs
WARRANTY: 7 Years