... oil diameter:1.5",2",2.5",3",4",6". Bottom Brass Connection Stainless Steel Oil Filled Pressure Gauge 1. Diameter: ... 3.Window:polycarbonate;4.Internal: brass, stainless steel;5.Inlet thread:1/8", 1/4", 3/8 ... male connection;7.Range:0~10,000psi;8.Scale:psi,bar, Mpa, Kpa, kg/cm2,Hg Single ... glyceine, silicone oil;10.Accuracy: 2.5%,1.6%,1%. Bottom Brass Connection Stainless Steel Oil Filled Pressure Gauge