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Graco 188176 Piston Seal 25:1

The Graco 188176 Piston Seal 251 is a genuine OEM sealing component that ensures proper piston fluid containment and pressure control within compatible pump assemblies.

  • OEM piston seal
  • Maintains proper pressure
  • Reduces internal leakage
  • Fits compatible Graco pumps

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Graco 188176 Piston Seal 251 – OEM High-Pressure Seal

Compatible Machines

  • Graco high-pressure airless sprayers
  • Graco industrial fluid pumps
  • Graco professional spray systems with matching piston assembly

The Graco 188176 Piston Seal 251 is an OEM replacement seal engineered to maintain pressure and reduce internal bypass in piston pump assemblies, ensuring smooth, consistent performance.

Part Number 188176
Description Piston seal for high-pressure applications
Function Seals piston to minimize leakage
Application High-pressure fluid pumping

Key Features

  • OEM replacement seal for proper fit
  • Helps maintain pressure and pump efficiency
  • Reduces internal leakage and wear
  • Durable for heavy-use environments

Installation & Usage Tips

  • Ensure old seal is completely removed before installation.
  • Lubricate lightly to ease installation.
  • Inspect mating surfaces for wear.
  • Test pressure after installation.

Frequently Asked Questions

It seals the piston to prevent internal fluid leakage and maintain pressure.

Yes — it’s a genuine OEM seal designed for compatible Graco pumps.

Replace when pressure drops or leakage is observed.

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