Graco 100509 Plug Pipe

The Graco 100509 Plug, Pipe is a genuine OEM part designed to seal unused ¼″ NPT ports on Graco airless sprayers and manifolds, ensuring leak-free performance and system integrity.

Part Number: 100509
Thread Size: ¼″ NPT (female)
Used In: Ultra XT 650, Ultimate Plus 1500, LineLazer 3500, Ultimate 500 & 750 Ultra Plus models
Function: Seals open manifold or filter ports
Material: High-strength metal for long-term durability

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Description

Overview of Graco 100509 Plug, Pipe (¼″ NPT)

Compatible Machines

This OEM plug is used across multiple Graco sprayers and assemblies that utilize a ¼″ NPT female port in fluid or air manifolds.

Graco 650 Ultra XT — Lo Boy
Graco 650 Ultra XT — Hi Boy
Graco 1500 Ultimate Plus (series)
Graco 3500 LineLazer (series)
Graco 500 Ultimate (series)
Graco 750 Ultra Plus (series)
Other Graco units using a ¼″ NPT plugged port (verify port size before purchase)

Key Specifications

Part Number	100509
Official Name	Plug, Pipe
Thread Size	¼″–18 NPT (tapered)
Typical Use	Seals/blocks unused or service ports on manifolds, filters, pump blocks and related plumbing on Graco sprayers.
Category	OEM Graco hardware / fittings

Why choose Graco 100509?

Correct ¼″ NPT taper for leak-resistant sealing in Graco assemblies.
OEM geometry ensures proper thread engagement and serviceability.
Simple drop-in replacement for damaged or missing port plugs.

Common Locations on the Sprayer

Filter/manifold blocks (unused service ports)
Pump housing and fluid passages that require sealing
Air/flush line terminations (where specified)

What’s in the Box

1 × Graco 100509 Plug, Pipe (¼″ NPT)

Frequently Asked Questions

Functionally it’s a ¼″ NPT pipe plug, but this is an OEM Graco part. Using OEM helps ensure the correct thread tolerance and fit in Graco manifolds and blocks.

It appears on multiple Graco platforms including 650 Ultra XT (Lo/Hi Boy), 1500 Ultimate Plus, 3500 LineLazer, 500 Ultimate, and 750 Ultra Plus. It may also be used anywhere a ¼″ NPT female port requires a plug. Always verify via your parts list or port size on the machine.

Yes—NPT is a tapered thread. Apply PTFE tape or a Graco-approved liquid sealant per your service manual, and tighten to the recommended torque for the port material.

Check your unit’s parts manual for the port call-out, or measure the thread OD (~0.54″ for ¼″ NPT). If unsure, compare with a known ¼″ NPT male fitting—threads should engage smoothly by hand before tightening.

It appears in both, depending on the model. It’s commonly seen on filter/manifold blocks and other service/inspection ports that must be sealed.