... connection diameter:1.5",2",2.5",3",4",6". Black Steel Case Dual Scale Dry Pressure Gauge 1. Diameter: 1 ... ½", 2", 2 ½ ",3",4",6";2.Case: black ... center back male connection;7.Range:0~10,000psi;8.Scale:psi,bar, Mpa, Kpa, kg/cm2,Hg Single ... or dual scale or according to customers order.9.Oil composing:glyceine, ...