Graco 15C998 Backup Washer
$5.25
In Stock
The Graco 15C998 Backup Washer supports the piston-valve seal and helps prevent leakage in pump assemblies.
- Durable OEM replacement part
- Supports primary valve seal
- Ensures smoother pump operation
- Easy installation during rebuild
Quantity
Genuine OEM Part
Fast Shipping (Order by 1 PM CST)
Easy Returns
Graco 15C998 Backup Washer – Function & Details
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.
Specifications
| 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 |
Key Features
- Secondary sealing surface: Adds backup support to primary valve seal.
- OEM-grade quality: Made by Graco for precise fit.
- Durable construction: Can handle repetitive valve cycling.
- Low complexity: Easy to service and replace.
Installation Notes
- Disassemble piston-valve to access the washer.
- Remove the old backup washer carefully.
- Clean the seating area thoroughly before installation.
- Install the new 15C998 washer in correct orientation.
- Reassemble the valve and test for leaks under pressure.
Frequently Asked Questions
It provides a secondary seal that supports the primary valve seat and reduces leakage risk.
Reusing a worn or deformed washer can impair sealing. It’s best to install a new 15C998 for reliable performance.
Replace it whenever you rebuild the piston-valve or notice leaks, loss of pressure, or seal wear.
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