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Graco 26B354 Kit, O-Ring-H2 Pt-4 replaces Graco 15H831

Graco 26B354 PTFE O-Ring provides a durable, chemical-resistant seal for high-pressure Graco pump systems.

  • Made from PTFE for enhanced wear and chemical resistance
  • Fits pumps such as 26B354 used in Mark X HD & 7900 HD units
  • Ensures leak-free operation and stable pressure performance
  • Genuine OEM part for reliable compatibility

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Graco 15H831 PTFE O-Ring — Technical Overview

Compatible Machines

  • Graco TexSpray Mark X HD (Standard & regional variants using the 17H831 pump)
  • Graco TexSpray 7900 HD configured with the 17H831 pump

Product Description

Graco 26B354 is a genuine OEM PTFE O-Ring (also known as 338 PTFE) used in Graco high-pressure airless sprayer pumps. Its design ensures a reliable, chemical-resistant seal — particularly important in texture or heavy-duty spraying applications.

Key Features

Part Number 26B354
Material PTFE (Polytetrafluoroethylene)
Seal Type O-Ring
Application Fluid section / pump packing
Common Use Used in Graco pumps (e.g. the 17H831 piston pump) for high-pressure sprayers.
Chemical Resistance Excellent resistance to many solvents, coatings, and abrasive materials

Maintenance & Installation Tips

  • Always inspect O-rings for signs of wear, cuts, or deformation when servicing your pump.
  • Lubricate the O-ring lightly with compatible fluid or PTFE-safe lubricant before installation.
  • Ensure the groove is clean from debris or old sealant to avoid leaks.
  • When replacing, torque components evenly to prevent damaging the new O-ring.
  • Use genuine Graco parts for reliable fit and durability.

Frequently Asked Questions

PTFE O-rings (like the 26B354) offer superior chemical resistance, lower friction, and better durability under harsh conditions compared to standard elastomer O-rings. They are ideal for high-pressure sprayers and use with abrasive or solvent-laden materials.

Replacement frequency depends on usage and the type of material being sprayed. For heavy texture jobs, consider inspecting and replacing the O-ring during every major pump service. For lighter use, less frequent replacement may suffice.

While it's possible to use aftermarket O-rings, using genuine Graco parts like the 26B354 ensures proper dimensions, material compatibility, and long-term reliability. OEM parts are often designed to precise tolerances that match Graco pump components exactly.

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