Graco 181879 Rod Displacement

The Graco 181879 Rod, Displacement is a vital OEM component for maintaining smooth and powerful spray performance in airless sprayers. It connects the pump drive to the piston, ensuring efficient suction and pressure delivery during operation.

Designed for Ultra 400, Ultra 500, EM380, EM390, and EM490 models.
Provides consistent spray output and pressure stability.
Ideal for professional and high-duty applications.
Ensures proper fit, durability, and long service life.

Retail Price: $233.5

You save: $54.17 (23.20%)

Our Price: $179.33

Based on 0 reviews

Description

Compatibility & Key Details for Graco 181879 Rod, Displacement

Compatible Machines

This OEM Rod, Displacement (Graco 181879) is used in the following Graco airless sprayers:

• Ultra 400
• Ultra 500
• EM380
• EM390
• EM490

Tip: Always verify against your sprayer’s parts manual by model and serial range before ordering.

Overview

The Graco 181879 Rod, Displacement (often called a piston/displacement rod) links the drive mechanism to the pump’s piston. On each stroke, it draws material into the pump and then pushes it out under pressure—critical for consistent, high-efficiency spraying.

Quick Specs

OEM Part Number	181879
Part Name	Rod, Displacement (piston/displacement rod)
Category	Pump internals / displacement pump assembly
Fits	See Compatible Machines list above
Typical Symptoms When Worn	Poor pressure, pulsation, weak spray pattern, leakage, reduced output

Why Choose the OEM Graco 181879

Exact fit and stroke alignment for supported models
Restores pump performance and pressure stability
Reduced downtime vs. off-spec alternatives
Designed for heavy-duty, professional use

Installation & Care Notes

Inspect packings, seals, and seats; replace any worn items during rod replacement.
Ensure the rod is straight and seating surfaces are clean before reassembly.
Prime with appropriate solvent/clean material after installation to verify suction and pressure.
Follow torque specs and safety procedures in the official service manual.

Frequently Asked Questions

Yes. It’s commonly referred to as a piston/displacement rod—the link between the drive and the pump piston in displacement-type sprayers.

Match your sprayer’s exact model and serial range with the parts manual. For supported units (e.g., Ultra 400, Ultra 500, EM380, EM390, EM490), this is the correct OEM rod—verify before purchase.

Pressure drop, pulsation, poor atomization, difficulty priming, and visible leaks. Always inspect packings and seats along with the rod.

It’s strongly recommended to install new packings/seals when replacing the displacement rod to ensure proper sealing and service life.

Yes—this listing is for the genuine Graco 181879 OEM rod unless otherwise specified in the product options.