Haz Loc Flex Coupling Trade Size 4 in Flex Length 21 in Overall Length 29 3/16 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 4 in MNPT x 4 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 4 in Compatible Conduit Type IMC RMC Connection Orientation Multi-Angle