The Graco 15C998 Backup Washer supports the piston-valve seal and helps prevent leakage in pump assemblies.
The Graco 15C998 is a backup washer used in the piston-valve assembly of Graco displacement pumps. It provides a secondary sealing surface behind the primary valve components, helping to maintain reliable fluid control and reduce leakage risk.
| Part Number | 15C998 |
|---|---|
| Type | Backup washer for piston valve |
| Function | Secondary seal behind main valve seat |
| Material | Resilient polymer or elastomer washer |
| Placement | Behind piston-valve main sealing surface |
| In Repair Kits | Included in Graco valve/piston repair kits |
| Maintenance Interval | Inspect during valve rebuilds or leakage |
