... 3.5", 4", 6" 2.Connection: brass, stainless steel,plastic 3.Dial and pointer: aluminum Liquid-filled Pressure Gauge:(1)Diameter: 1-1/2", 2 ... ", 2-1/2", 4"(2)Case:304 stainless steel(3)Window: ... /8" 1/2"NPT, BSP, BSPT(7)Pressure Range: 0-30Psi-10000Psi(8)Accuracy: 3-2-3% Stainless Steel Pressure Air Gage/ Liquid filled pressure gauge