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