Graco 100083 Coupling 3/8 To 1/4 Npt
$86.00
In Stock
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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