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