"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. Window Material Temperature compensating polycarbonate, Accuracy ASME/ANSI B40.1 Grade A 2-1-2, Max. PSI 60, Range PSI 0-60, Dial White aluminum, 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, Movement Brass, Pointer Black enameled aluminum, Mount Type Back."