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Graco 100083 Coupling 3/8 To 1/4 Npt

Graco 100083 Coupling (3/8 to 1/4 NPT) is a precision adapter designed to connect hoses or fittings with different NPT thread sizes in Graco sprayers and ram systems.

  • Connects 3/8 NPT to 1/4 NPT
  • Used in ToughTek M680a and Ram Supply Units
  • Ensures secure, leak-free thread connection
  • Durable design for high-pressure fluid systems

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Graco 100083 Coupling — Overview & Compatibility

Compatible Machines

The Graco 100083 Coupling (3/8 to 1/4 NPT) is used across several Graco fluid systems that transition from 3/8 NPT to 1/4 NPT ports.

  • ToughTek M680a / M680a CS Mortar Sprayer — air line & hose bundle interfaces that call out 100083 Coupling.
  • Ram Supply Units (per Graco parts manuals), including:
    • Model 918379 — 3 in Ram, 50:1 King/CM1000
    • Model 918386 — 3 in Ram, 55:1 Bulldog/CM450

Product Summary

The Graco 100083 Coupling is a compact adapter for connecting 3/8 NPT to 1/4 NPT threads in high-pressure coating and mortar systems. Use it to bridge hoses, valves, or ports of different NPT sizes while maintaining a tight, tapered-thread seal.

Key Specifications

Part Number 100083
Type Coupling / Adapter
Thread Sizes 3/8 NPT  to  1/4 NPT
Thread Standard NPT (National Pipe Taper)
Typical Use Connects mismatched NPT ports/hoses in Graco sprayers, ram units, and mortar systems
Pressure/Material Refer to your equipment manual for exact rating and material suitability

Where This Coupling Helps

  • Stepping down from a 3/8 NPT pump/manifold port to a 1/4 NPT hose or fitting
  • Joining a 3/8 NPT hose to 1/4 NPT gun/line components
  • Service replacements in kits that specify 100083

Frequently Asked Questions

No. 100083 is NPT only. Do not mix NPT with BSP; it can cause leaks or thread damage. Match thread standards precisely.

The coupling steps between 3/8 NPT and 1/4 NPT. Check the stamped or dimensional side and match to your port sizes. When coupling hoses, connect the larger hose toward the sprayer to maintain flow/pressure.

Use a thread sealant approved for your coating or mortar material and system pressure. Avoid over-application; keep sealant out of the fluid path.

Graco parts lists identify 100083 usage but do not always publish a standalone rating. Verify the rating in your unit’s manual and ensure it meets your system’s maximum working pressure.

Inspect threads, apply the correct sealant, align carefully to avoid cross-threading, tighten to spec, then pressure-test the system and re-check after first use.

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