... case center back male connection oil composing:glycerine, silicone oil diameter:1.5",2",2.5",3",4",6". Panel Mount Stainless ... /8",1/2",NPT,BSPT,BSP;6.Connection: bottom connection, center back male connection;7.Range:0~10,000psi;8.Scale ... , silicone oil;10.Accuracy: 2.5%,1.6%,1%. Panel Mount Stainless Steel Liquid Filled Glycerine Pressure Gauge