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Graco 100730 Bushing 3/8 Npt X 1/8 Npt

The Graco 100730 Bushing is a high-quality 3/8 NPT male × 1/8 NPT female adapter designed for reducing thread sizes in spray and circulation systems. It ensures secure, leak-resistant connections between different NPT fittings.

  • Part Type: Reducing Bushing / Adapter
  • Thread Size: 3/8 NPT (M) × 1/8 NPT (F)
  • Use: Connect smaller fittings to larger NPT ports
  • Compatible Models: 224570 Basic Sprayer, 235130 Circulating Sprayer

$35.11
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Graco 100730 — Overview & Specs

Compatible Machines

This Graco 100730 Bushing (3/8 NPT male × 1/8 NPT female) is confirmed in the parts documentation for the following units:

  • Graco Model 224570 — Basic Sprayer
  • Graco Model 235130 — Circulating Sprayer (one-gun)

What is Graco 100730?

The Graco 100730 Bushing is a reducing adapter that steps a 3/8 NPT (male) port down to a 1/8 NPT (female) thread. It enables installation of smaller instruments or fittings (e.g., gauges, valves, hose fittings) into larger NPT ports on spray and circulation systems.

Technical Details

Part Number 100730
Part Type Bushing / Reducing Adapter
Thread (Male) 3/8 NPT
Thread (Female) 1/8 NPT
Primary Use Adapts larger NPT ports to accept smaller NPT-threaded fittings and accessories.
Typical Locations Manifolds, regulators, gauges, circulation lines, and accessory ports on spray systems.

Fitment Guidance

  • Verify the host port is 3/8 NPT (tapered).
  • Confirm the mating accessory uses 1/8 NPT (female thread inside the bushing).
  • Use thread sealant compatible with the sprayed material and follow manufacturer torque guidance.

Frequently Asked Questions

It reduces a 3/8 NPT port to a 1/8 NPT female opening so you can install smaller NPT-thread components (e.g., gauges, valves, fittings).

Yes. NPT is a tapered pipe thread standard. Always use appropriate thread sealant and avoid over-tightening to protect manifolds and fittings.

Commonly on manifolds, circulation lines, and accessory ports, including models like 224570 (Basic Sprayer) and 235130 (Circulating Sprayer).

No. This listing is for the bushing only unless otherwise stated. Sealant is typically supplied separately according to your material compatibility.

Clean threads, apply compatible sealant, start by hand to avoid cross-threading, then tighten to spec. Re-check for leaks under pressure.

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