DESCRIPTION: Indication Range: 1~500mmAq, 0~5,000mmAq or according to customers order Case Nominal Diameter: 21/2", 3", 4" Case Material: Mild Steel; Steel Chromed Connection: Bottom Connection, Center Back Male Connection Inlet Thread: 1/4", 1/8", 3/8", BSP, BSPT, NPT or according to customers requirements Accuracy: 3"~4": 0.5~1% ; 21/2": 1~0.5%