Appleton Century Crofts RB400-300 Reducing Bushing Conduit

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.