Orbit Industries MRB-400/350 4 Inch Reducing Bushing

Product Description

The ORBIT INDUSTRIES MRB-400/350 is a 4-inch steel reducing bushing designed for use in rigid and EMT conduit systems. This fitting threads into a larger conduit hub and accepts a smaller conduit entry, allowing electricians to transition between conduit trade sizes at enclosures, junction boxes, and panel knockouts. Constructed from steel for durability in demanding electrical installations, the MRB-400/350 is a standard component in commercial and industrial conduit work where size transitions are required at termination points.

This reducing bushing is suited for use in rigid conduit fitting applications across commercial and industrial electrical installations. It is classified under UNSPSC code 39131700, consistent with rigid and EMT conduit bushing products. Electricians and electrical contractors working with rigid metal conduit systems will encounter this fitting type when terminating conduit runs into enclosures or equipment with differing knockout sizes.

Key Features

• Steel construction for strength and durability in conduit installations
• 4-inch trade size reducing bushing for rigid and EMT conduit systems
• Threaded design for secure fit at enclosures, panels, and junction boxes
• Enables conduit trade size transitions at termination points
• Classified as a rigid conduit fitting per UNSPSC 39131700

Compatibility

Designed as an OEM-style replacement and standard fitting for 4-inch rigid metal conduit and EMT conduit systems requiring a reducing bushing at enclosure or panel entry points.

Installation Notes

Installation should be performed by a licensed electrician in accordance with the National Electrical Code (NEC) and applicable local codes. De-energize and lock out the circuit or equipment before beginning any conduit fitting work. Thread the bushing fully into the hub opening and ensure a secure, tight connection before pulling wire. Do not overtighten to the point of damaging threads on the enclosure or bushing.