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.
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) |
