Insulating Bushing, Plastic, Trade Size 4 in, Overall Length 11/16 in, Finish Plain, Insulated Yes, Compatible Conduit Type RMC, Thread Size 4 In.-8, Thread Type NPT, Thread Gender Female, Conduit Fitting Type Bushing, Standards UL Listed, For Use With Fittings, Threaded RMC, For Conduit Type IMC, RMC, Overall Height 4 29/32 in, Overall Width 4 29/32 in, Weight 0.12 lb, Color Gray, Compatible Conduit Trade Size 4 in, Connection Type Threaded, Inside Diameter 3.82 in, Outside Diameter 7.75 in