Graco 104129 Back-Up Ring
$153.00
In Stock
The Graco 104129 Back-Up Ring is designed to reinforce O-ring seals in high-pressure pump and filter assemblies, preventing extrusion and ensuring long-lasting leak protection.
- OEM Part Number: 104129
- Type: Back-Up Ring for O-ring support
- Used in: Selected Graco high-pressure sprayer and pump systems
- Ensures tight sealing and longer service life
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Precision Back-Up Ring for High-Pressure Sealing
Compatible Machines
- Check your unit’s parts manual for item 104129 (Ring, Back-Up).
- Applies to selected Graco high-pressure pump / filter assemblies.
What is the Graco 104129?
The Graco 104129 Back-Up Ring (also shown as Ring, Back-Up) is a support ring used with an O-ring in high-pressure Graco assemblies. Its job is to prevent O-ring extrusion, maintain seal geometry, and help reduce leaks under pressure cycling—extending service life of the seal group.
| Attribute | Detail |
|---|---|
| OEM Part Number | 104129 |
| Type | Back-Up Ring (support ring for O-ring in high-pressure assemblies) |
| Typical Use | Pump / manifold / filter sealing to help prevent O-ring extrusion and leakage |
| Where Used | Selected Graco industrial finishing & airless sprayer systems (verify by model parts list) |
Installation & Service Tips
- Always replace the companion O-ring if worn, cut, or flattened.
- Clean the groove and adjacent surfaces; use only compatible assembly lubricant.
- Seat the back-up ring fully and in the correct orientation per your parts diagram.
- After reassembly, bring system pressure up gradually and check for leaks.
Frequently Asked Questions
Open your machine’s parts breakdown and search for 104129 in the pump/manifold/filter section. If listed, this is the correct Ring, Back-Up for that assembly.
Yes—inspect and replace the companion O-ring if there is any wear or damage to maintain sealing performance.
Material varies by assembly. Refer to your equipment’s parts documentation for the exact specification paired with 104129.
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