Graco 249125 Pump Rod With Piston Seat (Chromex)

The Graco 249125 Pump Rod with Piston Seat (Chromex) is a durable replacement rod assembly designed for professional airless paint sprayers. It ensures smooth piston movement and longer pump life.

Material: Chromex-coated steel for superior wear resistance
Includes: Pump rod and piston seat assembly
Fits: Ultra 395/495/595, Ultra Max II 490/495/595, FinishPro II 395/595
Purpose: Restores fluid section performance during pump rebuilds

Retail Price: $140.5

You save: $30.07 (21.40%)

Our Price: $110.43

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Description

Graco 249125 — Pump Rod with Piston Seat (Chromex) Overview

Compatible Machines

This Graco 249125 Pump Rod With Piston Seat (Chromex) fits many popular Graco contractor-grade airless sprayers. Always verify your exact model/version before purchase.

Graco 390 / 390 PC (select models)
Ultra 395 / Ultra 395 PC
Ultra 495 / Ultra 495 PC
Ultra 595 / Ultra 595 PC
Ultra Max II 490
Ultra Max II 495
Ultra Max II 595
FinishPro / FinishPro II 395
FinishPro II 595
LineLazer 3400 (pump lower variants using this rod)
GMax 3400 (pump lower variants using this rod)
Selected older units (e.g., ST-Pro, STX, 295ST, Nova 390, Ultimate Nova 395, Ultimate SuperNova 495) where specified by parts manual

What This Part Is

The 249125 is a pump rod assembly that includes a Chromex-coated rod and piston seat. The Chromex surface improves wear resistance and reduces friction for longer service life in demanding, high-pressure applications.

Key Benefits & Use

Durability	Chromex coating on the rod enhances hardness and wear resistance for extended pump life.
Performance	Restores smooth piston travel and sealing efficiency when rebuilding the fluid section.
Included	Pump rod + piston seat (piston valve/seat) as a matched assembly.
Typical Pairings	Commonly used with pump lowers such as 246428 Endurance Chromex (verify your lower by model & year).
Good For	High-duty coatings: acrylics, latex, primers, block-fillers (within the sprayer’s rated specs).

Fit & Identification Tips

Match by sprayer model + generation and by pump lower part number when possible.
Different generations of the “same” sprayer (e.g., Ultra 495) may use different rods.
If your sprayer is larger (e.g., Ultra Max II 695/795 or GMAX II 3900), it likely uses a different rod. Check the parts manual.

Frequently Asked Questions

Check your sprayer’s model, year, and especially the pump lower part number (e.g., 246428). Cross-reference in the parts manual or compatibility chart. If your pump lower differs, the rod may be different.

Chromex is a hard, wear-resistant surface treatment on the rod. It improves abrasion resistance, lowers friction, and helps the pump maintain performance longer between rebuilds.

It’s recommended. Inspect and typically replace V-packings, seals, and check the cylinder for wear. A fresh rod plus worn packings will not seal correctly.

Generally no—larger frames often use a different displacement rod. Verify your exact parts manual for those models; do not assume interchangeability with 249125.

Depressurize and flush the unit. Follow the pump-lower service procedure, torque to spec, use compatible lubricant on packings, and prime carefully after reassembly. Test at low pressure for leaks before full operation.