Straight Union - Conduit to Box, Thread Gender Female to Male, Trade Size 4 in, Compatible Conduit Type Vertical or Horizontal Rigid Conduit, Compatible Conduit Trade Size 4 in, Ends - Hazardous Fittings 4 in FNPT x 4 in MNPT, Overall Length 5 1/8 in, Overall Height 5 1/8 in, Overall Width 5 1/8 in, Aluminum, Finish Powder Coated, Hazardous Location Rating Class I, Division 1 and 2, Groups A, B, C, D, Class II, Division 1 and 2, Groups E, F, G, Class III, UNY, For Use With Conduit