304 stainless steel case bottom brass connection oil composing:glycerine, silicone oil diameter:1.5",2",2.5",3",4",6". Bottom ... Brass Connection Stainless Steel Oil Filled Pressure Gauge 1. Diameter: 1 ½", 2", 2 ½ ",3",4 ... or dual scale or according to customers order.9.Oil composing:glyceine, silicone oil;10.Accuracy: 2.5%,1.6%,1%. Bottom ...