Southwire LRB37 Malleable Reducing Bushing 4x3.5 in

Product Description

The SOUTHWIRE LRB37 is a malleable iron reducing bushing designed to transition between conduit or fitting openings of different sizes. Reducing bushings like this one are standard components in electrical raceway systems, used to adapt a larger knockout or fitting entry to accept a smaller conduit or connector. The LRB37 steps down from a 4-inch opening to a 3.5-inch entry. Malleable iron construction provides the durability and thread integrity required in conduit installations across commercial and industrial applications. Licensed electricians and electrical contractors are the primary installers of this fitting.

This reducing bushing is suited for use in electrical panel knockouts, junction boxes, conduit bodies, and enclosures where a 4-inch to 3.5-inch reduction is required. It is a common fitting in commercial electrical rough-in work, industrial control panel assembly, and service entrance installations. The threaded design allows it to seat securely in standard knockout openings machined to those dimensions.

Key Features

• Malleable iron construction for strong, reliable thread engagement
• Reduces a 4-inch opening to accept 3.5-inch conduit or fittings
• Threaded design for secure, tool-assisted installation in standard knockouts
• Compatible with common electrical enclosures, panels, and conduit bodies

Compatibility

Designed as an OEM-style reducing bushing for use in standard 4-inch threaded knockout openings requiring a 3.5-inch reduction, typical in commercial and industrial electrical enclosures and conduit systems.

Installation Notes

Installation should be performed by a licensed electrician in accordance with applicable NEC requirements. De-energize the enclosure or panel completely before installing or servicing any conduit fittings. Thread the bushing into the knockout by hand first, then tighten with the appropriate conduit wrench or pliers to ensure a secure, flush fit. Avoid over-tightening, which can crack the fitting or damage enclosure threads.

Technical Specifications

• Material: Malleable Iron
• Inlet Size: 4 inches
• Outlet Size: 3.5 inches

Standard Information

• Brand: SOUTHWIRE
• Manufacturer Part Number: LRB37