Graco 105522 U-Cup Seal

The Graco 105522 U-Cup Seal ensures a tight, leak-free seal for consistent spray performance in Graco airless sprayers.

Durable polyurethane construction
Prevents fluid blow-by and pressure loss
Fits multiple Graco models like 190 Classic, 395 ST Pro, and LineLazer 3400

$23.95

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Description

Detailed Overview of Graco 105522 U-Cup Seal

The Graco 105522 U-Cup Seal is a high-performance polyurethane piston seal designed for use in airless paint sprayers and pump assemblies. It ensures tight sealing between the piston and cylinder, preventing fluid leakage and maintaining consistent spray pressure. This seal is a critical part of the fluid section in several Graco airless sprayers and delivers long-lasting durability under demanding use.

Compatible Machines

Below is a list of Graco machines and sprayer models that use the 105522 U-Cup Seal as part of their displacement pump or fluid section:

Graco 190 Classic
Graco 290 Classic
Graco 395 ST Pro
Graco 450 ST
Graco 495 ST Pro
Graco EM 490
Graco LineLazer 3400
Graco FieldLazer S100
Graco FieldLazer S200
Graco Nova SP
Graco Super Nova SP
Graco Zip-Spray 1900 Plus

Key Features

Constructed from durable polyurethane for long life and resistance to wear.
Provides an excellent dynamic seal between piston rod and cylinder.
Prevents fluid blow-by, ensuring stable and efficient spray pressure.
OEM-grade component designed for precise fit and reliable performance.

Technical Specifications

Specification	Details
Part Number	105522
Material	Polyurethane
Type	U-Cup Seal
Compatibility	Fits various Graco airless paint sprayers (see list above)
Common Use	Displacement pump / fluid section sealing

Replacement Information

The Graco 105522 U-Cup Seal often pairs with backup washer part 186-652 (replaced by 196-759) in pump rebuild kits. Always confirm compatibility using your sprayer’s parts manual to ensure correct installation and performance.

Frequently Asked Questions

It seals the piston assembly inside the pump’s fluid section, preventing leakage and ensuring smooth fluid pressure during spraying operations.

Signs include fluid leaking from the pump, irregular spray patterns, or pressure loss. Regular inspection during pump maintenance can help identify wear early.

Yes, the 105522 U-Cup Seal can be used in OEM and quality aftermarket repair kits, provided the fluid-section components match Graco’s specifications.