Graco 166369 Paint Sprayer Piston

The Graco 166369 Piston is a heavy-duty OEM replacement designed for high-output industrial pump systems. Ideal for restoring pressure, performance, and pump reliability.

High-strength OEM piston
Ensures consistent spray pressure
Suitable for large industrial pump assemblies
Critical component for full pump rebuilds

$943.5

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Description

Graco 166369 Piston – OEM Replacement Part

Compatible Machines

This Graco 166369 Piston is used in select industrial and high-output Graco pump systems. Always match your sprayer’s pump assembly or consult your parts manual to ensure compatibility.

Designed for heavy-duty Graco industrial pump assemblies
Verify with pump model or serial number before ordering

About This Part

The Graco 166369 Piston is a genuine OEM replacement piston engineered for high-pressure airless paint sprayer pump assemblies. It ensures smooth piston movement within the displacement pump, maintaining consistent pressure and spray performance.

This component is commonly found in large-capacity units where precision, durability, and pump reliability are essential. Because pistons experience direct wear during operation, timely replacement helps protect the cylinder, packings, and overall sprayer output.

Key Features

High-strength OEM piston for maximum durability
Ensures smooth pump operation and consistent fluid delivery
Built to handle high-pressure industrial spraying environments
Ideal for restoring pump efficiency and preventing irregular spray patterns

When to Replace

Reduced pressure or inconsistent spray output
Worn packings or pump section leakage
Visible scoring or wear on the piston rod
During full pump rebuilds for optimal long-term performance

Frequently Asked Questions

Match the piston number with your sprayer’s pump parts diagram or verify using the pump’s model/serial number. Industrial Graco pumps use specific piston sizes, so confirming compatibility is essential.

Yes. Piston replacements are often paired with new packings, cylinder sleeves, and check valves to ensure full pump restoration and prevent premature wear of the new piston.

Graco industrial sprayers often use larger, specialized pump assemblies. The piston size, stroke, and machining must match the exact pump to ensure correct operation and prevent pressure loss or mechanical damage.