Insulating Bushing Iron Trade Size 4 in Overall Length 15/16 in Finish Zinc Plated Insulated Yes Compatible Conduit Type RMC Thread Type NPT Thread Gender Female Conduit Fitting Type Bushing Standards CSA Certified UL Listed For Use With Fittings Threaded RMC For Conduit Type IMC RMC Overall Height 4 7/8 in Overall Width 4 7/8 in Weight 1.07 lb Color Gray Compatible Conduit Trade Size 4 in Connection Type Threaded Inside Diameter 3.85 in Outside Diameter 4.9 in