"Brass movement with C shaped Bourdon tube. 1/4in. 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. Movement Brass, Recommended Use Air, gas, oil, water, Connection Size in. 1/4 Male NPT, Max. PSI 3,000, Dial White aluminum, Accuracy ASME/ANSI B40.1 Grade A 2-1-2, Fill Material Glycerin, Pointer Black enameled aluminum, Mount Type Stem, Gauge Diameter in. 4, Bourdon Tube C-shaped, Range PSI 0-3,000, Window Material Temperature compensating polycarbonate."