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