Please wait while we process your order...

Product successfully added to your cart.
Cart Image

Quantity in Cart: 1

Continue Shopping Shopping Cart
Item removed from Cart
X
 
×

sprayersandparts Logo

Product Image

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

Retail Price: $80.25
You save: $1.4 (1.74%)
Our Price: $78.85
0
Based on 0 reviews
5 ★
0%
4 ★
0%
3 ★
0%
2 ★
0%
1 ★
0%

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.

Subscribe to our newsletter to get exclusive discounts and new theme launches right in your inbox.

You may unsubscribe at any moment. For that purpose, please find our contact info in the legal notice.

Payment Method   Payment Method   Payment Method   Payment Method 

ADDRESS