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Graco 103557 Packing O-Ring

The Graco 103557 Packing O-Ring ensures a tight seal in spray gun assemblies, preventing leaks and maintaining consistent pressure performance.

  • OEM replacement part for Model D Spray Gun
  • Also fits ProMix Auto and PRO4000 series assemblies
  • Maintains proper fluid and air sealing integrity
  • Durable material for extended service life

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OEM Seal for Graco D-Gun & Selected Systems — Graco 103557 Packing O-Ring

Compatible Machines / Assemblies

  • Graco Model D Spray Gun (mixing chamber variants D-46, D-55, D-62, D-70, D-78)
  • Graco PRO4000 (legacy spray gun models listing 103-557 O-ring)
  • Graco ProMix Auto system assemblies that specify 103557 in their parts list

Product Overview

The Graco 103557 Packing O-Ring is a genuine OEM sealing ring used in Graco spray equipment to maintain pressure integrity and prevent fluid or air leaks at critical interfaces. It’s commonly installed in the Model D spray gun and appears in select ProMix Auto assemblies and certain legacy PRO4000 guns where specified.

  • Function: Seals dynamic/static joints in gun or manifold sub-assemblies to prevent bypass and pressure loss.
  • Performance: Supports consistent atomization by preserving stable system pressure.
  • Service Use: Replace during rebuilds or when leakage, pressure drop, or wear is observed.

Key Specifications

OEM Part Number 103557 (also referenced as 103-557 in older manuals)
Part Type Packing O-Ring (seal)
Primary Application Model D Spray Gun; appears in specified ProMix Auto assemblies; certain PRO4000 guns (per manual).
Installation Notes Lubricate lightly (per manual), seat without twisting, and confirm in-groove fit before reassembly.
When to Replace On rebuilds, evidence of leakage, loss of pressure, or visible damage/flattening.

Manual Cross-References

  • Model D Spray Gun parts list shows AS 103557 — O-ring within the assembly.
  • Legacy PRO4000 documentation lists 103-557 — O-RING (Viton) in the gun assembly.
  • ProMix Auto service/parts materials reference PACKING, O-RING 103557 in select modules.

Maintenance & Fit Guidance

  • Confirm your exact model and revision; Graco manuals occasionally list older part formatting (103-557).
  • Replace in pairs/sets if your assembly uses multiple seals in series to maintain balanced compression.
  • Use genuine Graco 103557 to ensure proper durometer and dimensional tolerance.

Frequently Asked Questions

No. It fits the Model D Spray Gun and specific assemblies (e.g., certain ProMix Auto modules and legacy PRO4000 guns) that explicitly list 103557 in the parts breakdown. Always verify with your model’s manual.

Visible cracks/flattening, fluid weep at the joint, loss of prime, or pressure instability. Replace during routine gun rebuilds or when these symptoms appear.

Yes—older manuals may display a hyphenated format (103-557). It refers to the same OEM part as 103557.

Typically no. Follow the Graco manual: clean the gland, lightly lubricate compatible elastomers, install without twisting, and torque mating parts to spec.

Check your equipment’s parts manual or contact support with your model and serial. If the breakdown lists 103557 PACKING, O-RING, it’s the correct part.

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