The Graco 104784 Filter Indicator (20 PSI) provides a clear visual alert when filter pressure rises, signaling the need for maintenance before system performance is affected.
Pressure Rating: Activates at 20 PSI differential
Use: For Graco filter housings and spray systems
Benefit: Prevents clogs, protects pumps, and ensures consistent flow
Graco high-pressure filter assemblies in spray and coating systems
Graco industrial finishing rigs with fluid filtration modules
Graco mobile manifolds and pump skid units using filter monitors
Graco equipment where a 20 PSI differential filter indicator is specified
Product Description
The Graco 104784 Indicator, Filter – 20 PSI is a visual warning device attached to filter housings that alerts operators when the filter element has reached a significant pressure drop—indicating that the element is becoming clogged and requires service. Once the differential pressure across the filter reaches approximately 20 PSI, the indicator changes appearance, prompting maintenance to avoid bypass or system degradation.
Key Features
20 PSI threshold: Provides early warning before major system pressure loss or filter bypass occurs.
Clear visual signal: Allows quick inspection without disassembly.
Durable construction: Built to withstand the high-pressure and high-cycle environments of Graco fluid systems.
OEM specified: Designed to match Graco filter housings and service intervals.
Maintenance aid: Helps reduce downtime by indicating proactive servicing rather than reactive failure.
Technical Specifications
Specification
Details
Part Number
104784
Function
Filter differential pressure indicator (≈20 PSI)
Installation
Mounted to filter housing, monitoring inlet vs outlet pressure
Environment
High-pressure fluid spray, coating, abrasive or solvent-rich systems
Material
Industrial grade housing and pressure sensor/indicator assembly
Applications
This indicator is used in Graco filtration systems where maintaining clean elements is critical—such as paint finishing lines, industrial coating rigs, mobile spray trailers and high-flow fluid transfer systems. When the indicator shows the threshold has been reached, the filter element should be serviced or replaced to safeguard system performance, prevent pump over-load and avoid coating defects.
Performance Advantages
Enables proactive maintenance — reduces risk of filter bypass or system contamination.
Helps maintain consistent fluid and spray pressure by ensuring filters remain within specification.
Improves system uptime — visible indicator allows quick check without full disassembly.
Reduces wear and damage to downstream equipment by ensuring proper filtration.
OEM compatibility ensures proper fit, calibration and reliability in Graco systems.
Maintenance Tips
During scheduled inspection, verify the indicator shows the normal (green) position. If the indicator shows the warning (red) or cross-sectioned section, relieve system pressure, open the filter housing, replace or clean the element, reset the indicator, and re-install. Ensure the mounting port is clean and the sensor is free of blockage. Replace the indicator if the visual signal fails or becomes delayed in response.
Frequently Asked Questions
It indicates that when the pressure drop across the filter element reaches approximately 20 PSI, the indicator changes state—to prompt element servicing before significant system impact occurs.
It is designed for Graco filter housings and systems requiring a 20 PSI differential indicator. Compatibility should be confirmed by matching part number and system configuration.
Follow system instructions: relieve pressure, mount indicator in the correct port, install according to orientation, and after filter service reset the indicator to normal state before restarting the system.
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Ignoring the warning may result in filter bypass, increased contamination reaching critical components, reduced spray quality, pump overload or failure, and increased downtime.
