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