Genuine Graco 164557 Packing O-Ring for sealing the pump/fluid section to prevent leaks and maintain spray pressure.
Use this genuine Graco 164557 Packing O-Ring to restore a reliable seal in pump/valve assemblies and prevent leaks or pressure loss.
Representative list — always verify with your model’s parts manual.
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.
| 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 |
