"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. Max. PSI 200, Recommended Use Air, gas, oil, water, Connection Size in. 1/8 Male NPT, Dial White aluminum, Bourdon Tube C-shaped, Accuracy ASME/ANSI B40.1 Grade A 2-1-2, Pointer Black enameled aluminum, Mount Type Back, Range PSI 0-200, Window Material Temperature compensating polycarbonate, Movement Brass, Fill Material Glycerin, Gauge Diameter in. 1 1/2."