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Threaded iron reducing bushing, chromate and powder coated, 3 in by 4 in

Appleton Century Crofts

Appleton Century Crofts RB400-300 Reducing Bushing Conduit

SKU CH-VFP7-71S0D

A threaded iron reducing bushing that joins 3-inch and 4-inch IMC or RMC conduit in hazardous locations, rated Class I Division 1 and 2, Class II Division 1 and 2, and Class III

  • TypeCable Management & Conduit
  • Reduces conduit size from 4 in to 3 in with threaded iron construction
  • Chromate, powder and electroplated finish resists corrosion in harsh environments
  • Rated for Class I Division 1 and 2 hazardous locations Groups B C D
  • Weighs 1.74 lb with 1 7/16 in overall length for compact fit
  • Female to male NPT threads enable secure IMC and RMC conduit connections

Conduit Reducing Bushing for Hazardous Locations

The Appleton Century Crofts RB400-300 is a threaded iron reducing bushing designed for hazardous-location conduit systems. It connects 3-inch female NPT threads to 4-inch male NPT threads on IMC or threaded rigid metal conduit. The fitting carries Class I Division 1 and 2, Class II Division 1 and 2, and Class III ratings for Groups B, C, D, E, F, G and IIA, IIB plus H2.

Sustained Performance in Corrosive Environments

Chromate, powder-coat and electroplated finishes protect the iron body during continuous exposure to moisture, chemicals and abrasive atmospheres. The 1.74 lb mass provides mechanical stability when conduit runs are subject to vibration or thermal cycling. Hazardous-location certifications remain valid as long as the thread engagement and finish integrity are maintained.

Straightforward Threaded Installation

The bushing installs by hand-tightening followed by a standard wrench turn to achieve a flame-tight joint. The 1 7/16 in overall length fits within typical conduit-body spacing without modification. Installers must verify that both conduit ends are cut clean and free of burrs; damaged threads are the most common cause of certification failure.

Highlights

  • Reduces conduit size from 4 in to 3 in with threaded iron construction
  • Chromate, powder and electroplated finish resists corrosion in harsh environments
  • Rated for Class I Division 1 and 2 hazardous locations Groups B C D
  • Weighs 1.74 lb with 1 7/16 in overall length for compact fit
  • Female to male NPT threads enable secure IMC and RMC conduit connections

Specifications

BrandAPPLETON ELECTRIC
TypeCable Management & Conduit

Questions about this item

How much heat does the iron body of this RB400-300 reducing bushing generate during continuous operation?

The fitting is a passive conduit component with no electrical or moving parts, so it produces no heat of its own.

What conduit and threading must already be in place for the 3 in FNPT x 4 in MNPT ends to connect?

You need 3 in and 4 in IMC or threaded RMC conduit with matching NPT threads to join the bushing.

Will the chromate, powder-coat and electroplated finish hold up when paired with older galvanised conduit?

The multi-layer coating resists corrosion in hazardous-location environments, maintaining integrity alongside legacy galvanised raceways.

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