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Graco 100172 Ball

The Graco 100172 Ball is a precision chrome-alloy component used inside Graco slip-ring couplers to ensure smooth locking and sealing performance.

  • Part Number: 100172
  • Material: Hardened chrome-alloy steel
  • Diameter: 0.188 in (4.76 mm)
  • Used In: Slip-Ring Coupler Assembly 208088
  • Function: Internal locking/check ball

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Precision Chrome-Alloy Ball for Graco Slip-Ring Couplers

Compatible Machines / Assemblies

This part is used inside specific Graco Slip-Ring Coupler assemblies. It is not tied to a particular sprayer model.

  • Graco Slip-Ring Coupler Assembly 208088 (uses internal balls of this size/spec)
  • Other Graco lubrication Slip-Ring Coupler assemblies that list Ball 100172 in their parts breakdown

Product Overview

The Graco 100172 Ball is a precision chrome-alloy sphere used inside select Graco slip-ring couplers to provide positive locking and reliable sealing. Its tight tolerance and hardened construction support long service life under repeated connect/disconnect cycles.

Key Specifications

Part Number 100172
Description Ball; chrome-alloy
Diameter 0.188 in (4.76 mm) nominal
Typical Use Internal locking/check ball for Slip-Ring Coupler assemblies
Material Hardened chrome-alloy steel for wear resistance

When to Replace

  • Coupler won’t lock or releases under pressure
  • Visible wear/flat spots or corrosion on existing balls
  • Persistent leakage at the coupler tip despite other service

Installation Tips

  • Confirm the coupler model (e.g., 208088) before ordering.
  • Clean the coupler body thoroughly; remove debris and old lubricant.
  • Handle new balls with care to avoid nicks; a small magnet pickup tool helps.
  • Lightly lubricate during assembly and verify smooth locking action.

Frequently Asked Questions

No—this part is an internal component for Graco slip-ring couplers. It is not installed directly on an airless sprayer pump or gun.

Check your coupler’s parts breakdown. If the list specifies 100172 for the internal balls (e.g., Assembly 208088), this is the correct part.

Many slip-ring couplers use multiple balls (often three) to lock and seal. Always verify the quantity in your specific assembly.

Nominal diameter is 0.188 in (4.76 mm), made from hardened chrome-alloy steel.

Keep the coupler clean, lubricate lightly, avoid side-loading during connection, and replace worn jaws/springs as needed to protect the new 100172 balls.

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