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