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 60, Range PSI 0-60, Fill Material Glycerin, Recommended Use Air, gas, oil, water, Bourdon Tube C-shaped, Connection Size in. 1/8 Male NPT, Gauge Diameter in. 1 1/2, Pointer Black enameled aluminum, Mount Type Back, Dial White Aluminum, Accuracy ASME/ANSI B40.1 Grade A 2-1-2, Movement Brass, Window Material Temperature compensating polycarbonate.