Thomas Betts 8420 Conduit Coupling 1-1/4 in Rigid Imc

Product Description

The THOMAS BETTS 8420 is a malleable iron compression conduit coupling designed for use with rigid metal conduit (RMC) and intermediate metal conduit (IMC) at a 1-1/4 inch trade size. The compression connection style provides a secure, concrete-tight fit without threading, making it a reliable choice for installations where conduit must be joined cleanly and quickly. This coupling is non-insulated and rated for concrete-tight applications, meaning it maintains a tight seal even when embedded in or routed through concrete structures. Electricians rely on this fitting type in commercial and industrial conduit runs where code-compliant mechanical integrity is required.

This coupling is suited for commercial, industrial, and residential electrical installations where rigid or IMC conduit systems are specified. Compression-style couplings are commonly used in exposed conduit work, underground applications, and concrete-encased raceways. The concrete-tight area of application rating makes the 8420 appropriate for slab and foundation conduit installations where moisture intrusion must be controlled and mechanical protection is critical.

Key Features

• Compression connection type — no threading required for a secure joint
• Concrete-tight area of application rating for embedded and wet-location conduit runs
• Malleable iron construction for durability in demanding installation environments
• Compatible with both rigid metal conduit and intermediate metal conduit (IMC)
• Non-insulated design for standard conduit coupling applications
• 1-1/4 inch trade size for mid-range conduit system configurations

Compatibility

Designed for use with 1-1/4 inch trade size rigid metal conduit (RMC) and intermediate metal conduit (IMC) in compression-fit conduit systems.

Installation Notes

Installation should be performed by a licensed electrician in accordance with the National Electrical Code (NEC) and applicable local codes. De-energize all circuits before working on or near the conduit system. Compression couplings require proper seating of the conduit ends and tightening of the compression nut to achieve a concrete-tight seal — do not overtighten, as malleable iron fittings can crack under excessive torque. Inspect conduit ends for burrs or damage before assembly to ensure a clean, secure connection.