Al Union Thread Gender Male to Female Trade Size 3 in Ends - Hazardous Fittings 3 in FNPT x 3 in MNPT Overall Length 4 1/16 in Outside Diameter 4.56 in Overall Width 4 7/16 in Weight 1.58 lb Aluminum Finish Unfinished Hazardous Location Rating Class I Divisions 1 and 2 Groups A B 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