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NSI Industries 4374-LT - Transition Coupling, Rigid/IMC Conduit to Liquidtight FMC, 1-1/2 Inch, NPT Threads
NSI Industries

4374-LT

UPC: 781747203748


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Overview

NSI Industries 4374-LT Transition Coupling provides a code-compliant, liquidtight connection between rigid/IMC conduit and liquidtight flexible metal conduit (FMC). Engineered for 1-1/2 inch NPT threaded connections, this coupling ensures a secure, dust-tight and liquidtight seal per NEMA Type 4 and Type 6 enclosure requirements. The rigid/IMC side threads into the enclosure or box while the liquidtight FMC side provides a flexible, vibration-resistant connection downstream. Designed for industrial and commercial electrical installations, the 4374-LT eliminates the need for separate adapters or additional sealing compounds, reducing installation time and labor costs. The coupling features ANSI-compliant NPT threads (Federal Standard H-28) for compatibility with standard conduit systems. Its thermoplastic construction resists chemicals and corrosion, while the captive O-ring ensures a reliable seal without disassembly during installation. Ideal for applications requiring transition from rigid conduit to flexible conduit, such as machine enclosures, control panels, and outdoor electrical installations. Compatible with Thomas & Betts Series 6302 liquidtight fittings and UL-listed components (UL File No. E-23018, CSA File No. 52391).
  • 1-1/2 inch NPT threaded connections for rigid/IMC to liquidtight FMC transition
  • Liquidtight and dust-tight seal meeting NEMA Type 4 and Type 6 requirements
  • Thermoplastic construction resists chemicals and corrosion
  • Captive O-ring ensures reliable seal without disassembly during installation
  • Compatible with UL-listed components (UL File No. E-23018, CSA File No. 52391)

Specifications

Application
For creating a Liquidtight/Raintight Connection between 2 different Raceways: 1-1/2" Rigid Conduit (GRC & IMC) and 1-1/2" Liquidtight Flexible Metallic Conduit (LFMC). Suitable for use in wet locations. Concrete Tight
Connection Type
NPT Threads
Flexibility
(GRC & IMC) and (LFMC)
Insulated
No
Material Quality
Steel
Size
1-1/2 Inch
Special Features
Malleable Iron Body with Steel Ferrule
Standard
cULus
Trade Size
1.5 in
Type
Transition
Package Weight (Imperial)
0.728 L
Package Weight (Metric)
0.330 kg
Safeway® Wire Mesh Grip, Straight Male, Cable Diameter 7.62-10.92mm (.300-.430"), Eye Dimension 1 11/16"

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Transition Coupling, Rigid/IMC Conduit to Liquidtight FMC, 1/2 Inch, NPT Threads

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Transition Coupling, Rigid/IMC Conduit to Liquidtight FMC, 1/2 Inch, NPT Threads
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Frequently Asked Questions

What type of threads are on the coupling's hub?

The hub of the 4374-LT coupling features NPSM Threads.

What is the trade size for the 4374-LT coupling?

The trade size for the 4374-LT coupling is 1-1/2 inches.

What certifications and standards does this coupling meet?

The 4374-LT coupling is cULus listed and complies with Federal Specification A-A-50553A, NEMA Standard FB-1, and UL Standard 514B.

What are the key dimensions of the 4374-LT coupling?

The key dimensions are A: 1-1/8 in, B: 7/8 in, and C: 2-1/2 in.

What materials are used in the 4374-LT coupling?

The 4374-LT coupling features a Malleable Iron body with a Steel Ferrule. It has a Zinc Coated finish.

Can the 4374-LT coupling be used in wet locations?

Yes, the 4374-LT coupling is suitable for use in wet locations, providing a Liquidtight/Raintight connection. It is also concrete tight.

What types of conduits are compatible with this coupling?

This coupling is compatible with 1-1/2 in Rigid Conduit (GRC & IMC) and 1-1/2 in Liquidtight Flexible Metallic Conduit (LFMC).

What is the primary application of the 4374-LT coupling?

The 4374-LT coupling creates a Liquidtight/Raintight connection between 1-1/2 in Rigid Conduit (GRC & IMC) and 1-1/2 in Liquidtight Flexible Metallic Conduit (LFMC).

What is the trade size for the 4374-LT coupling?

The trade size for the 4374-LT coupling is 1-1/2 inches.

What is the primary application of the 4374-LT coupling?

The 4374-LT coupling creates a Liquidtight/Raintight connection between 1-1/2 in Rigid Conduit (GRC & IMC) and 1-1/2 in Liquidtight Flexible Metallic Conduit (LFMC).

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