Graco 117391 U-Cup Packing Overview
Compatible Machines
| Machine Model | Application |
| Graco Mark V | High-pressure airless sprayer |
| Graco Mark X | Professional coatings pump |
| Graco Mark VII | Industrial piston pump |
| Graco King Series | Heavy-duty spray systems |
Product Highlights
The Graco 117391 Packing U-Cup provides precision wear resistance and sealing performance in demanding spray applications. Designed for Graco piston pumps, this U-Cup ensures consistent operation under extreme pressure and prevents leaks, delivering reliable durability for professional coatings jobs.
- Durable U-Cup seal designed for longevity in high-pressure environments
- Compatible with Graco piston pumps and airless sprayer equipment
- Optimizes flow and supports professional coatings with high-pressure filtration
Design & Material Features
- U-profile sealing lips engineered for low radial load and high dynamic stability
- Composite elastomer/PTFE construction for chemical compatibility
- Precision tolerances for repeatable installation in standard 0.030" to 0.045" gland widths
Performance & Applications
The 117391 U-Cup excels in maintaining leak-free operation under high-viscosity fluids, abrasive materials, and industrial coatings. It is suitable for:
- High-pressure paint circulation
- Hydraulic intensifiers
- Metering pumps and pneumatic actuators
- Chemical processing, oil & gas exploration, and automotive painting systems
Installation & Maintenance
- Ensure housings are free of scoring with chamfered entry angles
- Apply a thin film of compatible lubricant before assembly
- Maintain radial clearance of 0.002" to 0.003"
- Inspect regularly for extrusion, lip deformation, or flashing
Frequently Asked Questions
It is compatible with Graco Mark V, Mark X, Mark VII, and King Series high-pressure sprayers and piston pumps.
Yes, the U-Cup is designed for abrasive and high-viscosity fluids up to 200,000 cSt.
Clean the housing, lubricate the seal with compatible fluid, and maintain the specified radial clearance to ensure optimal performance.
