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Graco 164399 Backup Washer

Quick facts on Graco 164399 Washer, Backup — an OEM flat backing washer that supports spacing and alignment in select Graco pump/sprayer assemblies.

  • OEM Part No.: 164399
  • Type: Washer, Backup (flat support washer)
  • Role: Maintains stack-up alignment & load distribution
  • Verified model: EH 333 (check serial range)
  • Fitment tip: Confirm via your Graco OEM parts diagram

$19.64
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Product Overview & Compatibility for 164399

The Graco 164399 Washer, Backup is an OEM flat backing washer used in select Graco pump/sprayer assemblies to support components and maintain correct spacing under load.

Compatible Machines

Verified models where 164399 appears in OEM parts lists:

  • EH 333 Electric-Hydraulic Airless Sprayer (series; verify by serial range)

Key Details

OEM Part Number 164399
Official Description Washer, Backup (flat backing washer)
Function Supports adjoining components and maintains spacing/alignment in high-pressure assemblies.
Typical Location Pump/sprayer assembly stack-ups where a backing washer is specified by the OEM diagram.
Fitment Guidance Always match the washer to the position callout in your Graco parts list for the exact model/serial.

Helpful Notes

  • Use the exact Graco diagram for your machine to confirm quantity and location of 164399.
  • During replacement, inspect adjacent components (seats, spacers, seals) for wear or deformation.
  • Do not substitute generic washers unless dimensions and material meet the OEM specification.

Frequently Asked Questions

A backup washer is a flat support washer used to back or reinforce another component in the assembly. It helps maintain proper spacing and distributes load so the stack-up stays aligned under pressure.

Check your model and serial number, then open the OEM exploded parts list/diagram for your unit. Search for 164399 to verify the position and quantity. If the callout shows a different washer number for that location, do not substitute.

Only if the dimensions and material are identical to the OEM spec and the diagram shows an approved replacement. When in doubt, use the exact Graco 164399 to ensure proper fit and performance.

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