... designed.Suitable for GB3836-2000,IEC60079 standard request.Technical parameters:AH seriesflame-proof junction box code,outline and descriptions as the ... can be available. For Example:1.CBJH-3/4B means:AH explosion-proof junctino box,pipe thread G3",G3",G1",also ... special requirement can be made..CBJH-1/2Jmeans:AH explosion-proof juncton box,pipe thread G1/2",2perpendicular entries ...