Graco 222438 Piston Rod

The Graco 222438 Piston Rod is a durable OEM replacement part designed for efficient pump performance in several Graco airless sprayers. Ideal for restoring consistent pressure and smooth operation.

High-quality chrome-plated stainless steel rod
Ensures reliable paint flow and smooth cycles
Fits Ultra 333, 433, 750, 1000, GM 3500, and EM 590 sprayers

Retail Price: $467

You save: $122.35 (26.20%)

Our Price: $344.65

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Description

Compatibility & Key Details

Compatible Machines

This OEM rod fits the following Graco airless sprayers and legacy units:

Graco Ultra 333
Graco Ultra 433
Graco Ultra 750
Graco Ultra 1000
Graco Ultimate 1000
Graco GM 3500
Graco EM 590

Fitment tip: Always confirm with your sprayer’s parts manual and serial range before ordering.

Product Overview

The Graco 222438 Piston Rod (also called a displacement rod) is the internal drive rod that couples the pump piston to the transmission. During the upstroke, it helps draw coating into the pump; during the downstroke, it drives material to the outlet at pressure. Designed as a direct OEM replacement for select Graco Ultra/Ultimate, GM, and EM series sprayers.

Why Choose the OEM 222438

OEM fit & finish for reliable sealing and smooth pump cycles.
Durable construction (chrome-plated stainless steel in OEM configurations) for wear and corrosion resistance.
Restores performance if you’re seeing pulsation, pressure loss, or inconsistent spray patterns.
Easy drop-in replacement when servicing the lower pump.

At-a-Glance Specs

Attribute	Detail
Part Number	222438
Item	Graco 222438 Piston Rod / Displacement Rod
Material	Chrome-plated stainless steel (OEM)
Application	Lower pump assembly on compatible Graco airless sprayers
Includes	Rod only (seals/packings sold separately)

Fitment Notes

Use with the models listed above; check manual for any serial-range notes.
Replace worn packings and seats while servicing the rod for best results.
Prime with compatible fluids and follow Graco torque specifications during reassembly.

Frequently Asked Questions

Yes. It’s the OEM replacement rod designed for the select Graco Ultra/Ultimate, GM, and EM series listed above for proper fit and pump performance.

Common signs include pressure drop, pulsation, rattling from the lower, or uneven spray even after tip/packings maintenance. Inspect the rod surface for scoring or wear.

It’s best practice to install fresh packings, seals, and check seats during rod replacement. Refer to your pump’s packing kit and parts diagram for the correct kit number.

This listing targets the Ultra/Ultimate, GM, and EM models shown above. For other platforms, check the specific model manual or share your exact model/serial to confirm compatibility.

Use coatings within your sprayer’s rated viscosity and max pressure—typically architectural paints, primers, and stains compatible with your specific model.