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