Al Union Thread Gender Female to Female Trade Size 3 1/2 in Ends - Hazardous Fittings 3 1/2 in FNPT x 3 1/2 in MNPT Overall Length 3 in Outside Diameter 4.56 in Overall Width 4 7/16 in Weight 3.68 lb Steel Finish Zinc Plated Hazardous Location Rating Class I Divisions 1 and 2 Groups C D Class II Divisions 1 and 2 Groups E F G Class III Divisions 1 and 2 UNF For Use With IMC Rigid Conduit Threaded Conduit Conduit Fitting Type Union Connection Orientation Straight