Graco 166238 Packing O-Ring

Graco 166238 Packing O-Ring

Compatible Machines

This Graco 166238 Packing O-Ring fits any Graco sprayer or pump assembly where the parts manual specifically lists part number 166238. Because this O-ring is used across different sealing locations in various Graco systems, always verify compatibility by checking your machine’s parts breakdown.

• Graco sprayers that reference part 166238 in their service manual
• Hydra-Spray & GH-Series units (as listed by aftermarket sources)
• Other professional Graco pump and valve assemblies specifying 166238

Product Details

The Graco 166238 Packing O-Ring is a precision-molded seal designed to provide a tight, reliable barrier inside Graco pump and valve components. It prevents fluid bypass, maintains internal pressure, and supports smooth spray performance. This genuine OEM part ensures the correct fitment, durability, and sealing performance required for high-pressure paint and coating applications.

• Maintains a leak-free fluid path
• Helps preserve optimal spraying pressure
• Designed for high-pressure Graco equipment
• Ideal for pump rebuilds and routine maintenance

Installation Notes

• Depressurize sprayer fully before disassembly
• Clean sealing surfaces and remove debris before installing the new O-ring
• Lubricate lightly if recommended in your machine’s manual
• Confirm the O-ring sits evenly in its groove to avoid leaks

Frequently Asked Questions