Brass movement with C shaped Bourdon tube. 1/8 NPT male connection. For use with air, gas, oil or water. Black enameled aluminum pointer, white aluminum dial and temperature compensating polycarbonate window. Glycerin filled to dampen pulse and vibration. Accuracy ASME/ANSI B40.1 Grade A 2-1-2. Gauge Diameter in. 1 1/2, Window Material Temperature compensating polycarbonate, Pointer Black enameled aluminum, Movement Brass, Mount Type Back, Dial White Aluminum, Connection Size in. 1/8 Male NPT, Bourdon Tube C-shaped, Fill Material Glycerin, Range PSI 0-60, Recommended Use Air, gas, oil, water, Max. PSI 60, Accuracy ASME/ANSI B40.1 Grade A 2-1-2.