Appleton PLG plugs and reducers provide a variety of designs for closing up unused conduit openings or changing conduit size. They are used with threaded rigid and IMC conduit systems. Close-up plugs are used to seal threaded NPT conduit entries in hazardous or non-hazardous location enclosures. Bell reducers are used to join lengths of conduit with different diameters. Malleable iron, steel or aluminum close-up plugs. Explosionproof Class I & Dust-Ignitionproof Class II.