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
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
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