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Graco 164900 Backup Washer

Flat support/sealing washer used in packing stacks and fluid sections to reduce seal extrusion and leaks. Verify fitment in your model’s parts breakdown before ordering.

  • Part No.: 164900
  • Role: Backs and supports packings/seals
  • Typical use: Fluid section / manifold assemblies
  • Sold individually; quantity varies by assembly
  • Check manual/diagram for placement and count

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Fitment & Quick Details

Compatible Machines

Overview & Specifications

The Graco 164900 Backup Washer is a flat support/sealing washer used within fluid sections and related assemblies. It supports packings and helps maintain sealing integrity to prevent leaks and premature wear.

Part Number 164900
Type Washer, Backup (flat support/seal washer)
Typical Location Packing stacks, fluid sections, manifolds, or fittings where a backing washer is specified
Function Supports packings/seals, maintains compression, reduces extrusion and leakage
Common Materials Engineered polymer/nylon (per vendor listings)
Sold As Individual washer (quantity per machine varies by assembly)

Typical Assemblies Where Used

  • Packing stacks within the fluid section
  • Inlet/outlet manifold joints where a backup washer backs a seal
  • Fittings and adapters that specify a support washer to prevent seal extrusion

Installation Notes

  1. Confirm the part number in your machine’s parts diagram before installation.
  2. Inspect mating surfaces and packings; replace any worn components during reassembly.
  3. Install in the orientation shown in the service diagram to correctly support the seal.
  4. Tighten fasteners to the torque specified by the manufacturer for your assembly.

Frequently Asked Questions

It provides structural support behind a packing or seal so the seal maintains shape under pressure, reducing extrusion and leakage in the assembly.

Check your model’s official parts breakdown or service manual and look for part number 164900 in the relevant assembly (usually the fluid section or manifold).

Only if your manual lists an approved alternate or superseded number. Do not substitute without documentation—dimensions and materials can differ.

Quantity varies by assembly. Refer to your parts breakdown for the exact count and placement in the packing stack or manifold.

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