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Graco 103559 Packing O-Ring

Genuine Graco 103559 Packing O-Ring—OEM seal for select Graco pump assemblies, including Z-Pump S4. Use where part 103559 is specified to maintain pressure and prevent leaks.

  • Part #: 103559 (OEM)
  • Fits: Graco Z-Pump S4 series (5–70 cc); confirm via your parts manual
  • Function: Seals pump interfaces to prevent bypass/leakage
  • Material: Graco-specified elastomer (verify chemical compatibility)
  • Tip: Lightly lubricate and avoid twisting during install

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Overview & Compatibility for Graco 103559

Genuine Graco 103559 Packing O-Ring—an OEM sealing component used in select Graco pump assemblies to prevent leaks and maintain pressure integrity.

Compatible Machines

  • Graco Z-Pump S4 series (5 cc – 70 cc sizes)
  • Any Graco assembly whose parts manual explicitly lists 103559

What is it?

The Graco 103559 Packing O-Ring is a precision, OEM-grade elastomer seal that sits within pump sub-assemblies (e.g., cylinder, rod, or housing interfaces). It helps retain fluid pressure and prevents bypass or external leakage—critical for consistent spray performance and extended component life.

Why choose OEM?

  • Fit & Function: Manufactured to Graco tolerances for reliable sealing.
  • Chemical Compatibility: Material selection aligns with typical coatings and solvents used in Graco systems (verify against your chemistry).
  • Service Life: Correct hardness and profile support long service intervals when installed and maintained properly.

Technical Specifications

Part Number 103559
Description Packing O-Ring (OEM)
Primary Application Graco Z-Pump S4 series (5 cc–70 cc)
Function Seals pump interfaces to prevent leakage and maintain pressure
Material Graco-specified elastomer (verify for fluid/chemical compatibility)
Dimensions Refer to your model’s parts manual for exact ID/OD/cross-section
Packaging Sold individually (unless noted otherwise)
Notes Confirm by serial/model; some suppliers list as special-order

Fitment Notes

  • Use only where 103559 is specified in the official parts list.
  • Inspect groove and mating surfaces; replace worn components before installing a new O-ring.
  • Lightly lubricate per Graco service guidance to avoid nicks or twisting on install.

Frequently Asked Questions

No. It fits models/assemblies whose parts manuals specifically list 103559 (e.g., Z-Pump S4 series 5–70 cc). Always confirm against your exact model and serial number.

Dimensions (ID/OD/cross-section) can vary by application; Graco lists the part by number. Check your unit’s parts manual or contact support with your model for exact measurements.

Using a generic O-ring risks incorrect durometer, size tolerance, or material compatibility. For best performance and warranty alignment, use genuine Graco 103559.

Clean the groove, deburr edges, lubricate lightly, and avoid twisting during insertion. Verify orientation and torque settings per Graco service documentation.

Availability depends on distributor; some list 103559 as special-order with added lead time. Check local inventory prior to urgent repairs.

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