Al Union Thread Gender Female to Female Trade Size 2 1/2 in Ends - Hazardous Fittings 2 1/2 in FNPT x 2 1/2 in MNPT Overall Length 2 13/16 in Outside Diameter 4 in Overall Width 3 15/16 in Weight 1.07 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