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Graco 102778 Packing O-Ring

The Graco 102778 Packing O-Ring is a genuine OEM seal designed to maintain pressure and prevent leaks in Graco airless sprayers and pumps.

  • Authentic Graco replacement part.
  • Ensures leak-free performance and pressure retention.
  • Match by part number 102778 for proper fitment.

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OEM Details & Fitment Guide for 102778

Compatible Machines

  • Fits any Graco unit whose official parts diagram lists Graco 102778 Packing O-Ring.
  • Commonly used in Graco airless sprayer pumps and fluid sections where an OEM “Packing, O-Ring” is specified by this part number.
  • Please confirm against your sprayer’s model/serial parts list before ordering.

Product Overview

The Graco 102778 Packing O-Ring is a genuine OEM sealing component designed to maintain pressure integrity and prevent leaks in Graco fluid handling assemblies. Use this seal whenever your equipment’s service manual or exploded view calls out part 102778.

Key Benefits

  • Genuine OEM quality for reliable sealing and long service life.
  • Direct replacement by part number—minimizes downtime and guesswork.
  • Supports proper pump performance by helping maintain prime and pressure.

Specifications

Part Number 102778
Item Type Packing O-Ring (seal)
Brand / OEM Graco – genuine replacement part
Typical Application Fluid section sealing in compatible Graco airless sprayers / pumps where 102778 is specified
Fitment Note Match strictly by the OEM parts list for your exact model and serial range

Installation & Maintenance Notes

  • Depressurize equipment fully before service; follow all safety procedures.
  • Clean the groove and mating surfaces; inspect for wear or scoring.
  • Lightly lubricate if recommended by your service manual; seat the O-ring evenly.
  • Verify chemical compatibility between the elastomer and your coating material.

Frequently Asked Questions

Check the OEM parts diagram or service manual for your exact model and serial range. If it lists Graco 102778 Packing O-Ring, this is the correct replacement seal.

Graco typically identifies this seal by part number rather than publishing full dimensions/materials. Always match by the OEM number and verify compatibility with the fluids you use.

Reuse isn’t recommended—O-rings can take a compression set or harden with use. A new 102778 seal helps ensure leak-free performance and proper pressure retention.

Symptoms include difficulty priming, visible leakage, pressure loss, or material seeping past the fluid section. Inspect the seal and related components (packings, seats) and replace as needed.

Use clean, filtered materials; flush after use; store the sprayer per OEM guidance; and avoid solvents that aren’t compatible with the seal material. Always follow Graco’s maintenance schedule.

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