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Graco 15C039 Stainless Steel Diaphragm Plate

The Graco 15C039 Stainless Steel Diaphragm Plate provides a durable, corrosion-resistant backing for diaphragm pumps, ensuring consistent fluid displacement and longer pump life.

  • Compatible Pumps: Graco 3150 Series and similar diaphragm pumps
  • Function: Supports the diaphragm for proper sealing and flow
  • Material: Stainless steel for high durability
  • Easy Replacement: Fits directly during diaphragm rebuilds

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Compatible Machines for Graco 15C039 Diaphragm Plate

  • Graco 3150 Series Diaphragm Pumps
  • Graco Heavy‑Duty or High‑Performance Diaphragm Pump Models that use stainless fluid‑side diaphragm plates
  • Graco fluid sections / manifolds where the original design calls for a stainless steel “plate, fluid side” during diaphragm rebuilds

Graco 15C039 Stainless‑Steel Diaphragm Plate — Product Overview

The Graco 15C039 Stainless Steel Diaphragm Plate is a robust, OEM-grade fluid-side backing plate designed for use in Graco diaphragm pump modules. It provides a sturdy support surface for the pump diaphragm, ensuring reliable fluid displacement, improved durability, and long service life.

Key Features

  • Stainless Steel Construction: Built from corrosion-resistant stainless steel for strength and longevity under repeated cycles.
  • Precision Machined: Manufactured to tight tolerances, assuring even diaphragm support and consistent sealing.
  • OEM Replacement Part: Designed specifically for Graco diaphragm pump assemblies to match original-manufacturer geometry.
  • High Fatigue Resistance: Withstands constant flexing and pressure cycles, contributing to a more durable pump assembly.

Benefits

  • Better Durability: Stainless steel plate resists wear and deformation, extending the life of diaphragm assemblies.
  • Improved Seal Performance: Provides a firm, flat backer surface to help the diaphragm seat properly and reduce leaks.
  • Maintenance Friendly: Ideal for regular rebuilds — using genuine OEM plates reduces risk of premature failures.
  • Reliability Under Load: Handles repeated stress cycles without cracking or failing, ensuring pump integrity.

Technical Specifications

Part Number 15C039
Description Fluid-side Diaphragm Plate (Stainless Steel)
Material 304 / 316 Stainless Steel (OEM Spec)
Application Used behind diaphragm in pump fluid module to back the flexible diaphragm
Pump Compatibility Diaphragm pumps (such as Graco 3150) with removable diaphragm assemblies
Typical Use Case Diaphragm rebuilds, high-wear applications, chemical‑resistant service

Frequently Asked Questions

Stainless steel offers superior durability, resists corrosion, and holds up better under repeated diaphragm flexing, making it ideal for demanding or chemical‑intensive applications.

During a diaphragm rebuild, disassemble the fluid module, remove the old plate, clean mating surfaces, insert the new 15C039 plate, re‑install the diaphragm, and re-tighten bolts to the correct torque.

Replace the plate if it is warped, scratched, cracked, or shows signs of fatigue. It’s often replaced during diaphragm maintenance or when performance degrades or leaking occurs.

Yes — many Graco diaphragm rebuild kits (especially heavy‑duty kits) require a new fluid-side diaphragm plate. Be sure to check the kit's parts list to confirm whether the 15C039 is included.

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