... 2.5", 3", 3.5", 4", 6" 2.Connection: brass, stainless steel,plastic 3.Dial and pointer: aluminum Liquid-filled Pressure Gauge ... 1/2", 4"(2)Case:304 stainless steel(3)Window: glass, polycarbonate.(4)Bounden tube: 316 stainless steel, brass(5)Connection: stainless steel, brass(6)Connection size ... Range: 0-30Psi-10000Psi(8)Accuracy: 3-2-3% Stainless Steel Pressure Air Gage/ Liquid filled pressure gauge