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Graco 103778 Pipe Plug

The Graco 103778 Pipe Plug is a genuine OEM part designed to seal 1/2-14 NPTF threaded ports in Graco pump and manifold systems. Ideal for maintaining pressure integrity and preventing leaks.

  • Thread Size: 1/2-14 NPTF (Dryseal)
  • OEM Part Number: 103778
  • Used In: SaniForce 1590, 2150, 3250 & E-Flo SP Systems
  • Function: Seals unused ports or leak-detector openings

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Product Details & Fitment – Graco 103778 Pipe Plug (1/2-14 NPTF)

Compatible Machines

This OEM plug is used across multiple Graco sanitary and industrial pump systems. Confirm your parts diagram before ordering.

  • SaniForce 1590 High-Sanitation Diaphragm Pumps (used as plug in the center/air section)
  • SaniForce 3250 High-Sanitation Diaphragm Pumps (plug for leak-detector/air section ports)
  • SaniForce 2150 models for Ram-mounting (center section uses this plug)
  • E-Flo SP Electric Pump Systems (check-valve block/manifold assemblies include this plug)

What is the Graco 103778 Plug, Pipe, HDLS?

A genuine Graco pipe plug used to seal 1/2-inch NPTF female ports in pump center sections, leak-detector holes, and manifold/check-valve blocks on select systems. Typical functions include capping unused ports and closing inspection/leak-detector openings per OEM specifications.

Specifications

Part Number 103778
Description (OEM) PLUG, PIPE, HDLS – 1/2-14 NPTF (Dryseal)
Thread / Size 1/2-14 NPTF (fits 1/2″ NPTF female ports)
Type / Function Threaded pipe plug for sealing ports (center section, leak-detector holes, manifolds)
OEM Status Genuine Graco replacement part

Installation & Fitment Notes

  • Depressurize equipment, follow Graco lock-out procedures, and clean the port before installation.
  • Thread in by hand to start; tighten per equipment torque guidance to avoid thread damage.
  • Only use where manuals/parts lists specify 103778 or a 1/2-14 NPTF plug.

Frequently Asked Questions

It’s a 1/2-14 NPTF (Dryseal) pipe plug designed for 1/2″ NPTF female ports.

Verified examples include SaniForce 1590 and 3250 high-sanitation diaphragm pumps, certain SaniForce 2150 (Ram-mount) configurations, and specific E-Flo SP electric pump systems. Always confirm against your model’s parts list before ordering.

The sanitary/industrial manuals list the part number and function but do not always state material. If your application requires a specific material, consult the manual for your exact model or contact Graco/distributor support with your model and serial number.

Use the OEM part where specified. Even with matching 1/2-14 NPTF threads, non-OEM plugs may not meet the sealing, depth, or sanitation requirements of the system.

Common locations include the air/center section (inspection or service ports), leak-detector holes on high-sanitation pumps, and check-valve block/manifold ports in electric pump systems, as directed by the model’s service manual.

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