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Graco 115251 Seal U-Cup

The Graco 115251 U‑Cup Seal is a factory‑specified internal seal used inside pump or cylinder assemblies — sealing piston or rod to prevent fluid leaks and ensure stable pressure and fluid flow.

  • OEM U‑Cup seal for Graco pumps and fluid systems
  • Seals piston/rod to cylinder — prevents leaks and fluid blow‑by
  • Used in spray, paint, coating or fluid‑delivery pumps and systems
  • Essential for maintenance or replacement when original seal is degraded or leaking

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About the Graco 115251 U-Cup Seal

The Graco 115251 U-Cup Seal is an OEM-specified fluid-seal used to seal piston or rod assemblies inside cylinders of Graco pumps and fluid-handling equipment — ensuring leak-proof operation under pressure.

Compatible Assemblies / Use-Cases

  • Graco pump assemblies, displacement pumps or fluid-handling systems using piston/rod + cylinder mechanism
  • Spray, paint or coating systems requiring internal fluid-sealing to maintain pressure and avoid blow-by
  • Any Graco equipment whose parts diagram or service manual specifies “Seal, U-Cup – 115251”
  • Maintenance or rebuild work — replacing worn, damaged, or leaking seals with correct OEM-grade U-Cup seal for reliable performance

Product Details

Part Number 115251
Description U-Cup Seal / Internal Pump Seal (OEM)
Function Seals piston/rod to cylinder — prevents fluid leakage, blow-by or pressure loss
Typical Use Pumps, fluid cylinders, displacement pumps, spray/coating fluid-handling systems
OEM Status Genuine Graco part — ensures correct fitment, sealing performance and compatibility with Graco housings

Why Use This U-Cup Seal?

  • Provides reliable fluid-tight sealing inside pump or cylinder — prevents leaks and blow-by
  • Maintains proper pressure and fluid delivery performance in spray, paint or coating systems
  • OEM-specified — correct dimension, material, and compatibility with Graco assemblies
  • Essential for maintenance or rebuilds when original seals degrade or fail, to restore original performance

Frequently Asked Questions

It seals the piston or rod inside the fluid-cylinder, preventing fluid from leaking past the piston and ensuring consistent pressure and fluid delivery.

Yes — 115251 is listed among official Graco U-Cup seals in parts-catalogs and spare-parts lists.

Replace the seal if you notice fluid leakage, loss of pressure, inconsistent spray or pump performance — or during regular maintenance / overhaul to restore proper sealing.

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