Graco 25D189 Piston Repair Kit with PTFE/PE (145)

Graco 25D189 PTFE/PE Piston Repair Kit Overview

Compatible Machines

This piston repair kit is designed for Graco lower pumps with the 145-size piston packing configuration.

• Graco Xtreme™ Lower Pumps – 145cc class
• Graco XP Proportioner Systems with 145cc fluid sections
• Industrial Graco airless sprayer systems using compatible 145-size lowers

Key Product Information

Product Description

The Graco 25D189 Kit, Repair, Piston, PTFE/PE (145) is an OEM piston seal kit intended for rebuilding 145-size piston assemblies in Graco lower pumps. PTFE and UHMWPE packings provide excellent chemical resistance, long wear life, and maintain proper sealing performance in high-demand spray applications.

Using this kit helps restore pump efficiency, reduces internal leakage, and ensures consistent spray pressure. Always confirm your lower pump’s displacement and model before installation.

Service & Maintenance Notes

• Replace during routine lower pump maintenance or rebuilds
• Inspect piston rod and cylinder for wear prior to installation
• Lubricate packings as recommended in your pump service manual
• Use the correct 145-size kit for optimal sealing performance

Frequently Asked Questions