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Graco 105277 Back-Up Ring

The Graco 105277 Back-Up Ring is a genuine PTFE seal support designed for high-pressure Graco sprayers and filters. It ensures leak-free performance and longer seal life.

  • Part Number: 105277
  • Material: PTFE (Teflon)
  • Pressure Rating: Up to 3000 psi
  • Compatible With: Graco King, Merkur, and President Series
  • Function: Prevents O-ring extrusion under pressure

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Graco 105277 Back-Up Ring – High-Pressure PTFE Seal Support

Graco 105277 Back-Up Ring is a precision-engineered PTFE support ring that enhances seal reliability in high-pressure airless sprayers. Designed for durability and chemical resistance, it prevents O-ring extrusion and ensures consistent performance under extreme pressure cycles.

Compatible Machines

  • Graco High Pressure Filters (Model 244067, 244068, 244069)
  • Graco Merkur ES Spray Packages
  • Graco King Airless Sprayer Series
  • Graco President and Senator Pumps
  • Graco AirPro and G40 Spray Guns

Key Features

  • Material: Virgin PTFE (Teflon) for superior chemical resistance
  • Pressure Rating: Up to 3000 psi (210 bar)
  • Temperature Range: -30°C to 150°C
  • Prevents seal extrusion in high-pressure assemblies
  • Enhances pump efficiency and seal longevity
  • OEM genuine Graco replacement part

Technical Specifications

Property Specification
Part Number 105277
Material PTFE (Teflon)
Operating Pressure Up to 3000 psi (210 bar)
Temperature Range -30°C to 150°C
Function Prevents O-ring extrusion under high pressure
Applications Airless Sprayers, Filtration Systems, Piston Pumps

Benefits

  • Increases service life of Graco sprayers
  • Minimizes downtime and leakage
  • Simple installation and maintenance
  • Compatible with solvent-based and high-solids coatings

Maintenance Tips

  • Inspect backup and O-rings every 500 hours of operation.
  • Replace when visible deformation or wear appears.
  • Use compatible solvent cleaners; avoid abrasives.
  • Ensure proper torque when reassembling filter housings.

Frequently Asked Questions

It supports the O-ring in high-pressure systems, preventing extrusion and maintaining a tight seal for consistent pressure and leak-free operation.

It fits most medium- and high-pressure Graco filter assemblies and sprayers, including the King, Merkur, and President models. Always verify part number before purchase.

It is made from PTFE (Teflon), offering excellent chemical resistance and stability in temperatures up to 150°C.

Conclusion

The Graco 105277 Back-Up Ring delivers reliability and performance for Graco airless sprayers and filtration assemblies. Its PTFE composition, high-pressure tolerance, and precision design make it an indispensable component for professional finishing systems seeking longer seal life and minimized maintenance downtime.

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