Haz Loc Flex Coupling, Trade Size 2 1/2 in, Flex Length 18 in, Overall Length 26 in, Stainless Steel, Hazardous Location Rating Class I, Division 1 and 2, Groups D, Class II, Division 1 and 2, Groups E, F, G, Class III, Ends – Hazardous Fittings 2 1/2 in MNPT x 2 1/2 in MNPT, Thread Gender Male to Male, Application Used In Areas Where Vibration and/or Movement is a Problem, Natural Finish, Compatible Conduit Trade Size 2 1/2 in, Compatible Conduit Type IMC, RMC