... ", 2.5", 3", 3.5", 4", 6" 2)Connection size: 1/8" 1/4" 1/2" 3)CE Certificate ... case,brass polished case, all this can take with front flange, backflange and U-clamp.BEZEL MATERIAL:Steel black ... case,brass polished case, all this can take with front flange, backflange and U-clamp.BEZEL MATERIAL:Steel ... accuracy, recalibrators,restrictors, special connections and more. Back Connection Steel Case Gauge 4Z2