Al Union Thread Gender Male to Female Trade Size 4 in Ends - Hazardous Fittings 4 in FNPT x 4 in MNPT Overall Length 4 1/4 in Outside Diameter 5.13 in Overall Width 5 1/8 in Weight 1.63 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