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Graco 164557 Packing O-Ring

Genuine Graco 164557 Packing O-Ring for sealing the pump/fluid section to prevent leaks and maintain spray pressure.

  • Part No.: 164557
  • Type: Packing O-Ring (seal stack)
  • Common fits: Ultra 395, Ultra 495, Ultra Max II 490/495/595 (verify manual)
  • Replace if leaking, flattened, or chemically swollen
  • Install per model parts diagram; lubricate lightly

$41.82
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Compatibility & Key Details for Graco 164557

Use this genuine Graco 164557 Packing O-Ring to restore a reliable seal in pump/valve assemblies and prevent leaks or pressure loss.

Compatible Machines

Representative list — always verify with your model’s parts manual.

  • Graco Ultra 395
  • Graco Ultra 495
  • Graco Ultra Max II 490
  • Graco Ultra Max II 495
  • Graco Ultra Max II 595
  • Graco LineLazer series (models specifying 164557)

What is it?

The 164557 is a genuine Graco Packing O-Ring used in fluid end/pump seal stacks. It helps maintain correct sealing pressure, reduces bypass, and supports consistent spray performance.

Quick Specs

Part Number 164557
Type Packing O-Ring (pump/valve seal)
Typical Material PTFE/chemical-resistant elastomer (verify per model manual)
Primary Function Seals fluid path to prevent leaks and pressure loss
Installation During pump rebuilds or seal service; lubricate and seat per manual

Fitment & Service Notes

  • Match by machine model and pump revision that lists 164557 in the parts diagram.
  • If your exact model isn’t shown above, check the pump seal stack callout in your manual.
  • Replace O-rings showing flattening, nicks, chemical swelling, or recurring leaks.

Frequently Asked Questions

Not all. Compatibility depends on the pump revision and seal stack used. Confirm by checking your sprayer’s parts manual for the exact O-ring number.

Leaks at the fluid section, pressure drops, slow prime, or inconsistent spray fan often point to worn or damaged O-rings in the seal stack.

Clean the groove, lightly lubricate the O-ring, and seat it without twisting. Follow torque and orientation notes in the official Graco manual for your model.

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