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Graco 100403 Plug Pipe 1/8-27 Nptf

The Graco 100403 Plug Pipe 1/8-27 NPTF securely seals unused or inspection ports in high-pressure systems, ensuring leak-free operation and system integrity.

  • Thread Type: 1/8-27 NPTF (Dryseal)
  • Function: Seals regulator, manifold, or pump body ports
  • Material: Durable, corrosion-resistant metal
  • OEM Quality: Designed for Graco industrial systems

$12.26
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Compatible Machines / Systems

  • Any Graco equipment or assembly with a 1/8-27 NPTF (female) port that requires sealing with a pipe plug.
  • Graco regulator and manifold blocks that list 100403 in their OEM parts diagrams.
  • Industrial finishing components (manifolds, pump bodies, gauge ports) using 1/8-27 NPTF service/inspection ports.
  • Service replacements on legacy Graco regulators and fluid sections where a Plug, Pipe 1/8-27 NPTF is specified.

What is Graco 100403 Plug Pipe 1/8-27 NPTF?

The Graco 100403 is a precision pipe plug used to seal unused or service ports in fluid and air circuits. With 1/8-27 NPTF threads, it provides a reliable, leak-resistant seal in high-pressure spray systems and regulator/manifold assemblies.

Key Specifications

Part Number 100403
Part Name Plug, Pipe 1/8-27 NPTF
Thread Type NPTF (Dryseal), 1/8-27
Function Seals unused/inspection ports on regulators, manifolds, pump bodies, and gauge tees.
Typical Systems Graco industrial finishing, airless application manifolds, regulator housings, and service blocks.

Benefits

  • Correct 1/8-27 NPTF thread for tight, leak-resistant sealing without thread deformation.
  • Ideal for capping unused ports to maintain system pressure integrity and cleanliness.
  • OEM part for consistent fit and dependable performance across compatible Graco assemblies.

Installation Notes

  • Confirm port size and thread type (NPTF 1/8-27) before installation.
  • Clean threads; apply a compatible sealant if specified by your manual (many NPTF joints seal without additional compound, but follow OEM guidance).
  • Tighten to the torque recommended in your equipment manual to avoid thread damage.

Frequently Asked Questions

Check your OEM parts list for 100403 or verify that the unused port is 1/8-27 NPTF female. If either is true, this plug is a match.

No. NPTF (Dryseal) is designed to seal without sealant by thread interference. NPT often relies on sealant to achieve leak-tightness. Always match your port’s thread standard.

Many NPTF joints seal dry, but follow your equipment manual. If a sealant is specified, use a compatible product for the sprayed material and pressure rating.

On regulator housings, fluid manifolds, gauge ports, and pump body inspection/service ports that specify a Plug, Pipe 1/8-27 NPTF.

It can, provided the port is 1/8-27 NPTF and the material compatibility and pressure ratings meet your application requirements. For OEM Graco machines, use 100403 where specified.

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