Skip to content

Country

ST-64 Upstream Chemical Injector 4.0+ GPM – OEM Replacement Part

by Suttner
Original price $58.25 - Original price $58.25
Original price
$58.25
$58.25 - $58.25
Current price $58.25

Part Number: 4569
Category: Pressure Washer Components → Chemical Injectors → Upstream Chemical Injectors
Type: ST-64 Upstream Chemical Injector


The ST-64 Upstream Chemical Injector 4.0+ GPM (Part #4569) is a professional-grade OEM replacement chemical injector designed for upstream chemical injection in pressure washer systems. Manufactured by Suttner, this injector introduces detergents and cleaning solutions into the water supply side of the system, allowing chemicals to be mixed before entering the pressure washer pump.


Key Features & Benefits

  • Genuine Suttner OEM replacement part
  • Upstream chemical injection design
  • Optimized for pressure washers over 4.0 GPM
  • Installs directly into water supply lines
  • 3/4" FGH inlet connection
  • 3/4" MGH outlet connection
  • Simple installation and operation
  • Compact, lightweight design
  • Suitable for detergent and cleaning solution application
  • Ideal for commercial pressure washing systems

Technical Specifications

Part Number: 4569

Manufacturer: Suttner

Product Type: Upstream Chemical Injector

Injection Type: Upstream Injection

Flow Requirement: Greater Than 4.0 GPM

Inlet Connection: 3/4" FGH

Inlet Thread Type: Female Garden Hose Thread

Outlet Connection: 3/4" MGH

Outlet Thread Type: Male Garden Hose Thread

Maximum Temperature: 160°F

Application: Detergent & Chemical Injection

OEM Replacement: Yes


Typical Applications

  • Pressure washer detergent systems
  • Commercial cleaning equipment
  • Vehicle washing operations
  • Building exterior cleaning
  • Equipment wash-down systems
  • Agricultural cleaning equipment
  • Water supply line chemical injection
  • General-purpose cleaning applications
  • Pressure washer system upgrades

Performance Advantages

  • Introduces chemicals directly into the water supply stream
  • Simple garden hose connection installation
  • Designed for pressure washers operating above 4.0 GPM
  • Supports consistent detergent application
  • Compact design minimizes installation space requirements
  • Reliable Suttner construction for long service life
  • Suitable for a variety of cleaning chemicals and detergents
  • Helps simplify chemical application systems
  • Ideal for commercial cleaning environments

Maintenance Recommendations

  • Flush the injector thoroughly with clean water after chemical use.
  • Inspect pickup tubing and fittings regularly for wear or blockage.
  • Check connections periodically for leaks.
  • Clean injector components if chemical buildup occurs.
  • Use only compatible cleaning chemicals and detergents.
  • Inspect the unit during routine pressure washer maintenance to ensure proper operation.

Important Note on Upstream Injection

Upstream injectors introduce chemicals before the pump, meaning cleaning solutions pass through the pressure washer pump and plumbing system. Always verify chemical compatibility with your pump manufacturer’s recommendations before using acids, bleach, or aggressive chemicals in an upstream injection system. For many corrosive chemicals, a downstream injector may be the preferred solution.

Explore All Products

Shop Now

Compare products

{"one"=>"Select 2 or 3 items to compare", "other"=>"{{ count }} of 3 items selected"}

Select first item to compare

Select second item to compare

Select third item to compare

Compare