Graco 166074 Packing O-Ring

$71.75

Available to Order

Part #: 166074

The Graco 166074 Packing O-Ring is a genuine OEM seal designed to prevent leaks and maintain fluid pressure in Graco sprayers and pumps.

Replaces worn or damaged sealing rings.
Ensures leak-free performance and smooth operation.
Used in select Graco fluid-end and pump assemblies.
Durable OEM construction for long service life.

Genuine OEM Part Fast Shipping (Order by 1 PM CST) Easy Returns

Graco 166074 Packing O-Ring

Compatibility & Fitment Guidance

This OEM seal fits Graco machines that reference part number 166074 in their parts diagram/service manual. If your model’s breakdown lists 166074, it is compatible.

Check your sprayer’s parts book or pump lower breakdown.
Match the exact part number “166074” in the seal/packing stack.
Confirm quantity required per assembly before ordering.

Overview & Key Details

The Graco 166074 Packing O-Ring is a genuine replacement sealing element used in the fluid end of select Graco sprayers and pump assemblies to prevent bypass, maintain pressure, and reduce leakage. It restores proper sealing performance when the original ring has worn or been damaged.

Specifications

Part Number	166074
Type	Packing / O-Ring (seal)
Brand	Graco (OEM)
Typical Location	Fluid-end sealing stack (e.g., pump lower / gland area)
What It Fixes	Leakage, pressure loss, or poor priming due to a worn seal
Package Contents	1 × O-ring (quantity per machine may vary)

Functions & Benefits

Restores sealing integrity in the fluid end.
Helps maintain consistent spray pressure and pattern.
OEM dimensions for proper fit in listed assemblies.
Reduces downtime caused by leaks and rework.

Installation Tips

Clean the groove/gland; remove debris and inspect for scoring.
Lightly lubricate with a manufacturer-approved lubricant.
Avoid twisting/stretching during installation; seat evenly.
Inspect rods, sleeves, and packings; replace worn components together.
Verify correct orientation and quantity if part of a packing stack.

Frequently Asked Questions

Question	Answer
How do I confirm this fits my sprayer?	Open your model’s parts diagram or service manual and look for part number 166074 in the fluid-end/packing stack. If listed, it fits.
Do I need more than one O-ring?	Some assemblies require multiple seals. Always check the quantity shown for your exact model in the breakdown before ordering.
When should I replace it?	Replace when you see fluid leakage, pressure loss, or during scheduled packing maintenance. Frequent abrasive use may require earlier replacement.
Can I substitute with a non-OEM ring?	Non-OEM dimensions/materials may differ and can lead to premature failure. OEM parts are recommended for proper fit and performance.