Graco 164391 Backup Washer
$34.70
In Stock
Keep your sprayer leak-free with the Graco 164391 Washer, Backup—a support ring that stabilizes seals under pressure.
- Function: Backs up O-rings to prevent extrusion and leakage.
- Typical Location: Pump/valve sealing stack in Graco sprayers.
- When to Use: During rebuilds or if pressure loss/fluid seep is observed.
- Fit Check: Confirm part callout 164391 in your model’s parts manual.
- Pro Tip: Replace with adjacent O-rings for best sealing performance.
Quantity
Genuine OEM Part
Fast Shipping (Order by 1 PM CST)
Easy Returns
Compatible Machines
At this time, a model-by-model list for Graco 164391 is not confirmed. Please verify against your unit’s parts manual (pump/valve section) before ordering.
Overview & Key Details
The Graco 164391 is a precision Washer, Backup used to support seals and help prevent leakage in Graco spray equipment assemblies.
| Part Number | 164391 |
|---|---|
| Item Name | Washer, Backup |
| Function | Supports primary seals/O-rings to improve sealing and reduce extrusion under pressure. |
| Typical Location | Pump, valve, or fluid section interfaces within Graco sprayer assemblies. |
| Use Case | Maintenance or rebuilds where restoring leak-free performance is required. |
Why this part matters
- Provides backup support to sealing elements under operating pressure.
- Helps maintain leak prevention and consistent pressure performance.
- Designed to fit specific assemblies within Graco equipment (confirm via manual/kit).
Installation & Fit Guidance
- Match the 164391 callout in your sprayer’s exploded view before purchase.
- Inspect adjacent O-rings/seals; replace as a set if wear or deformation is present.
- Lubricate per Graco guidelines during reassembly to protect sealing surfaces.
Frequently Asked Questions
Check the parts manual for your exact model and pump/fluid section. Look for the part callout 164391 in the diagram or the bill of materials. If your manual lists a kit, verify whether this Washer, Backup is included in that kit number.
| Frequently Asked Questions | |
|---|---|
| Where to check | Pump section / valves / fluid manifold pages in the manual |
| What to match | Exact part number 164391 or kit contents |
| Tip | Compare dimensions/shape with the removed backup washer |
Common indicators include fluid seepage at seal interfaces, inability to hold pressure, or visible deformation/extrusion of the sealing stack. During rebuilds, replace the Washer, Backup along with associated O-rings for best results.
Reuse is not recommended. Even minor wear can compromise seal support under pressure. For reliability, install a new Graco 164391 when servicing the sealing stack.
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