Graco 15C998 Backup Washer

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

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